diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f79d2538..63afdbe8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
         run: Build/Scripts/runTests.sh -p ${{ matrix.php }} -t ${{ matrix.TYPO3 }} -s functional
         if: matrix.TYPO3 == '14'
 
-      - name: Acceptance Tests
+      - name: Acceptance Tests Classic
         run: Build/Scripts/runTests.sh -p ${{ matrix.php }} -t ${{ matrix.TYPO3 }} -s acceptance -- --fail-fast
       - name: Archive acceptance tests results
         uses: actions/upload-artifact@v6
@@ -54,6 +54,14 @@ jobs:
           name: acceptance-test-reports-${{ matrix.php }}-${{ matrix.TYPO3 }}
           path: .Build/Web/typo3temp/var/tests/_output
 
+      - name: Acceptance Tests Composer
+        run: Build/Scripts/runTests.sh -p ${{ matrix.php }} -t ${{ matrix.TYPO3 }} -s acceptanceComposer -- --fail-fast
+      - name: Archive acceptance tests results
+        uses: actions/upload-artifact@v6
+        if: always()
+        with:
+          name: acceptance-test-composer-reports-${{ matrix.php }}-${{ matrix.TYPO3 }}
+          path: .Build/Web/typo3temp/var/tests_composer/_output
       - name: Archive composer.lock
         uses: actions/upload-artifact@v6
         if: always()
diff --git a/.gitignore b/.gitignore
index 2d37b767..119b2597 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,4 +11,8 @@ config
 .cache
 composer.json.orig
 composer.json.testing
-bck-runTests.sh
\ No newline at end of file
+Build/acceptance_tests/composer.json
+Build/acceptance_tests/composer.lock
+Build/acceptance_tests/vendor
+Build/acceptance_tests/b13-container
+Build/acceptance_tests/public
\ No newline at end of file
diff --git a/Build/Scripts/runTests.sh b/Build/Scripts/runTests.sh
index f73307a7..12426204 100755
--- a/Build/Scripts/runTests.sh
+++ b/Build/Scripts/runTests.sh
@@ -1,12 +1,41 @@
 #!/usr/bin/env bash
 
 #
-# TYPO3 core test runner based on docker.
+# TYPO3 core test runner based on docker or podman.
 #
 if [ "${CI}" != "true" ]; then
     trap 'echo "runTests.sh SIGINT signal emitted";cleanUp;exit 2' SIGINT
 fi
 
+printSummary() {
+    cleanUp
+
+    echo "" >&2
+    echo "###########################################################################" >&2
+    echo "Result of ${TEST_SUITE}" >&2
+    echo "Container runtime: ${CONTAINER_BIN}" >&2
+    echo "Container suffix: ${SUFFIX}"
+    echo "PHP: ${PHP_VERSION}" >&2
+    if [[ ${TEST_SUITE} =~ ^(functional|acceptance|acceptanceComposer)$ ]]; then
+        case "${DBMS}" in
+            mariadb|mysql|postgres)
+                echo "DBMS: ${DBMS}  version ${DBMS_VERSION}  driver ${DATABASE_DRIVER}" >&2
+                ;;
+            sqlite)
+                echo "DBMS: ${DBMS}" >&2
+                ;;
+        esac
+    fi
+    if [[ ${SUITE_EXIT_CODE} -eq 0 ]]; then
+        echo "SUCCESS" >&2
+    else
+        echo "FAILURE" >&2
+    fi
+    echo "###########################################################################" >&2
+    echo "" >&2
+    exit ${SUITE_EXIT_CODE}
+}
+
 waitFor() {
     local HOST=${1}
     local PORT=${2}
@@ -53,7 +82,7 @@ handleDbmsOptions() {
                 exit 1
             fi
             [ -z "${DBMS_VERSION}" ] && DBMS_VERSION="10.4"
-            if ! [[ ${DBMS_VERSION} =~ ^(10.1|10.2|10.3|10.4|10.5|10.6|10.7|10.8|10.9|10.10|10.11|11.0|11.1)$ ]]; then
+            if ! [[ ${DBMS_VERSION} =~ ^(10.4|10.5|10.6|10.7|10.8|10.9|10.10|10.11|11.0|11.1|11.2|11.3|11.4)$ ]]; then
                 echo "Invalid combination -d ${DBMS} -i ${DBMS_VERSION}" >&2
                 echo >&2
                 echo "Use \".Build/Scripts/runTests.sh -h\" to display help and valid options" >&2
@@ -69,7 +98,7 @@ handleDbmsOptions() {
                 exit 1
             fi
             [ -z "${DBMS_VERSION}" ] && DBMS_VERSION="8.0"
-            if ! [[ ${DBMS_VERSION} =~ ^(5.5|5.6|5.7|8.0|8.1|8.2|8.3|8.4)$ ]]; then
+            if ! [[ ${DBMS_VERSION} =~ ^(8.0|8.1|8.2|8.3|8.4)$ ]]; then
                 echo "Invalid combination -d ${DBMS} -i ${DBMS_VERSION}" >&2
                 echo >&2
                 echo "Use \".Build/Scripts/runTests.sh -h\" to display help and valid options" >&2
@@ -126,7 +155,8 @@ Usage: $0 [options] [file]
 Options:
     -s <...>
         Specifies the test suite to run
-            - acceptance: backend acceptance tests
+            - acceptance: backend acceptance tests (classic mode, fixture-based instance)
+            - acceptanceComposer: backend acceptance tests against a real composer-installed TYPO3 instance
             - cgl: test and fix all core php files
             - composer: "composer" command dispatcher, to execute various composer commands
             - composerInstall: "composer install", handy if host has no PHP, uses composer cache of users home
@@ -165,7 +195,7 @@ Options:
                 - pdo_mysql
 
     -d <sqlite|mariadb|mysql|postgres>
-        Only with -s functional|functionalDeprecated|acceptance|acceptanceInstall
+        Only with -s functional|functionalDeprecated|acceptance|acceptanceComposer|acceptanceInstall
         Specifies on which DBMS tests are performed
             - sqlite: (default): use sqlite
             - mariadb: use mariadb
@@ -175,9 +205,6 @@ Options:
     -i version
         Specify a specific database version
         With "-d mariadb":
-            - 10.1   short-term, no longer maintained
-            - 10.2   short-term, no longer maintained
-            - 10.3   short-term, maintained until 2023-05-25
             - 10.4   short-term, maintained until 2024-06-18 (default)
             - 10.5   short-term, maintained until 2025-06-24
             - 10.6   long-term, maintained until 2026-06
@@ -187,19 +214,19 @@ Options:
             - 10.10  short-term, maintained until 2023-11
             - 10.11  long-term, maintained until 2028-02
             - 11.0   development series
-            - 11.1   short-term development series
-        With "-d mariadb":
-            - 5.5   unmaintained since 2018-12
-            - 5.6   unmaintained since 2021-02
-            - 5.7   maintained until 2023-10
-            - 8.0   maintained until 2026-04 (default)
+            - 11.1   short-term development series, maintained until 2024-08
+            - 11.2   short-term development series, maintained until 2024-11
+            - 11.3   short-term development series, rolling release
+            - 11.4   long-term, maintained until 2029-05
+        With "-d mysql":
+            - 8.0   maintained until 2026-04 (default) LTS
             - 8.1   unmaintained since 2023-10
             - 8.2   unmaintained since 2024-01
             - 8.3   maintained until 2024-04
             - 8.4   maintained until 2032-04 LTS
         With "-d postgres":
             - 10    unmaintained since 2022-11-10 (default)
-            - 11    maintained until 2023-11-09
+            - 11    unmaintained since 2023-11-09
             - 12    maintained until 2024-11-14
             - 13    maintained until 2025-11-13
             - 14    maintained until 2026-11-12
@@ -207,12 +234,12 @@ Options:
             - 16    maintained until 2028-11-09
 
     -g
-        Only with -s acceptance
+        Only with -s acceptance|acceptanceComposer
         Activate selenium grid as local port to watch browser clicking around. Can be surfed using
         http://localhost:7900/. A browser tab is opened automatically if xdg-open is installed.
 
     -x
-        Only with -s functional|unit|acceptance
+        Only with -s functional|unit|acceptance|acceptanceComposer
         Send information to host instance for test or system under test break points. This is especially
         useful if a local PhpStorm instance is listening on default xdebug port 9003. A different port
         can be selected with -y
@@ -300,11 +327,13 @@ CONTAINER_HOST="host.docker.internal"
 HOST_UID=$(id -u)
 HOST_PID=$(id -g)
 USERSET=""
+CI_JOB_ID=${CI_JOB_ID:-}
 SUFFIX=$(echo $RANDOM)
+if [ ${CI_JOB_ID} ]; then
+    SUFFIX="${CI_JOB_ID}-${SUFFIX}"
+fi
 NETWORK="b13-container-${SUFFIX}"
 PHPUNIT_EXCLUDE_GROUPS="${PHPUNIT_EXCLUDE_GROUPS:-}"
-# @todo Remove USE_APACHE option when TF7 has been dropped (along with TYPO3 v11 support).
-USE_APACHE=0
 
 # Option parsing updates above default vars
 # Reset in case getopts has been used previously in the shell
@@ -337,10 +366,6 @@ while getopts "a:b:s:d:i:t:p:xy:o:nhug" OPT; do
             if ! [[ ${TYPO3} =~ ^(13|14|14-dev)$ ]]; then
                 INVALID_OPTIONS+=("${OPTARG}")
             fi
-            # @todo Remove USE_APACHE option when TF7 has been dropped (along with TYPO3 v11 support).
-            [[ "${TYPO3}" -eq 13 ]] && USE_APACHE=1
-            [[ "${TYPO3}" -eq 14 ]] && USE_APACHE=1
-            [[ "${TYPO3}" -eq "14-dev" ]] && USE_APACHE=1
           ;;
         p)
             PHP_VERSION=${OPTARG}
@@ -391,28 +416,24 @@ fi
 
 handleDbmsOptions
 
-# ENV var "CI" is set by gitlab-ci. Use it to force some CI details.
-IS_CORE_CI=0
 if [ "${CI}" == "true" ]; then
-    IS_CORE_CI=1
+    # ENV var "CI" is set by gitlab-ci. Use it to force some CI details.
     CONTAINER_INTERACTIVE=""
+elif [ ! -t 0 ] || [ ! -t 1 ]; then
+    # If stdin or stdout is not a TTY (e.g. a script runner, pipe, or non-interactive shell),
+    # drop the interactive "-it" flags automatically to avoid podman warning "The input device
+    # is not a TTY." and docker failure, and to keep redirected output free of TTY control characters.
+    # Keep "--init" so the PID 1 init process still forwards signals (e.g. ctrl-c) to the test process.
+    CONTAINER_INTERACTIVE="--init"
 fi
 
 # determine default container binary to use: 1. podman 2. docker
 if [[ -z "${CONTAINER_BIN}" ]]; then
-  if [[ "${TYPO3}" == "11" ]]; then
-    if type "docker" >/dev/null 2>&1; then
-        CONTAINER_BIN="docker"
-    elif type "podman" >/dev/null 2>&1; then
-        CONTAINER_BIN="podman"
-    fi
-  else
     if type "podman" >/dev/null 2>&1; then
         CONTAINER_BIN="podman"
     elif type "docker" >/dev/null 2>&1; then
         CONTAINER_BIN="docker"
     fi
-  fi
 fi
 
 if [ $(uname) != "Darwin" ] && [ ${CONTAINER_BIN} = "docker" ]; then
@@ -455,10 +476,16 @@ ${CONTAINER_BIN} network create ${NETWORK} >/dev/null
 if [ ${CONTAINER_BIN} = "docker" ]; then
     # docker needs the add-host for xdebug remote debugging. podman has host.container.internal built in
     CONTAINER_COMMON_PARAMS="${CONTAINER_INTERACTIVE} --rm --network ${NETWORK} --add-host "${CONTAINER_HOST}:host-gateway" ${USERSET} -v ${CORE_ROOT}:${CORE_ROOT} -w ${CORE_ROOT}"
+    TMPFS_MOUNT_OPTIONS="rw,noexec,nosuid,uid=${HOST_UID},gid=${HOST_PID}"
 else
     # podman
     CONTAINER_HOST="host.containers.internal"
     CONTAINER_COMMON_PARAMS="${CONTAINER_INTERACTIVE} ${CI_PARAMS} --rm --network ${NETWORK} -v ${CORE_ROOT}:${CORE_ROOT} -w ${CORE_ROOT}"
+    TMPFS_MOUNT_OPTIONS="rw,noexec,nosuid"
+fi
+
+if [[ "${CI}" == "true" ]]; then
+    CONTAINER_COMMON_PARAMS="${CONTAINER_COMMON_PARAMS} ${CONTAINER_COMMON_PARAMS_CI:-}"
 fi
 
 if [ ${PHP_XDEBUG_ON} -eq 0 ]; then
@@ -488,31 +515,17 @@ case ${TEST_SUITE} in
         APACHE_OPTIONS="-e APACHE_RUN_USER=#${HOST_UID} -e APACHE_RUN_SERVERNAME=web -e APACHE_RUN_GROUP=#${HOST_PID} -e APACHE_RUN_DOCROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -e PHPFPM_HOST=phpfpm -e PHPFPM_PORT=9000 -e TYPO3_PATH_ROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -e TYPO3_PATH_APP=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance"
         ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d ${SELENIUM_GRID} --name ac-chrome-${SUFFIX} --network ${NETWORK} --network-alias chrome --tmpfs /dev/shm:rw,nosuid,nodev,noexec ${IMAGE_SELENIUM} >/dev/null
         if [ ${CONTAINER_BIN} = "docker" ]; then
-          if [[ "${USE_APACHE}" -eq 1 ]]; then
             ${CONTAINER_BIN} run --rm -d --name ac-phpfpm-${SUFFIX} --network ${NETWORK} --network-alias phpfpm --add-host "${CONTAINER_HOST}:host-gateway" ${USERSET} -e PHPFPM_USER=${HOST_UID} -e PHPFPM_GROUP=${HOST_PID} -e TYPO3_PATH_ROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -e TYPO3_PATH_APP=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -v ${CORE_ROOT}:${CORE_ROOT} ${IMAGE_PHP} php-fpm ${PHP_FPM_OPTIONS} >/dev/null
             ${CONTAINER_BIN} run --rm -d --name ac-web-${SUFFIX} --network ${NETWORK} --network-alias web --add-host "${CONTAINER_HOST}:host-gateway" -v ${CORE_ROOT}:${CORE_ROOT} ${APACHE_OPTIONS} ${IMAGE_APACHE} >/dev/null
-          else
-            # @todo Remove fallback when TF7 has been dropped (along with TYPO3 v11 support).
-            ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d --name ac-web-${SUFFIX} --network ${NETWORK} --network-alias web --add-host "${CONTAINER_HOST}:host-gateway" ${USERSET} -v ${CORE_ROOT}:${CORE_ROOT} ${XDEBUG_MODE} -e typo3TestingAcceptanceBaseUrl=http://web:8000/ -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" -e TYPO3_PATH_ROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -e TYPO3_PATH_APP=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance ${IMAGE_PHP} php -S web:8000 -t ${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance >/dev/null
-          fi
         else
-          if [[ "${USE_APACHE}" -eq 1 ]]; then
             ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d --name ac-phpfpm-${SUFFIX} --network ${NETWORK} --network-alias phpfpm ${USERSET} -e PHPFPM_USER=0 -e PHPFPM_GROUP=0 -e TYPO3_PATH_ROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -e TYPO3_PATH_APP=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -v ${CORE_ROOT}:${CORE_ROOT} ${IMAGE_PHP} php-fpm -R ${PHP_FPM_OPTIONS} >/dev/null
             ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d --name ac-web-${SUFFIX} --network ${NETWORK} --network-alias web -v ${CORE_ROOT}:${CORE_ROOT} ${APACHE_OPTIONS} ${IMAGE_APACHE} >/dev/null
-          else
-            # @todo Remove fallback when TF7 has been dropped (along with TYPO3 v11 support).
-            ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d --name ac-web-${SUFFIX} --network ${NETWORK} --network-alias web -v ${CORE_ROOT}:${CORE_ROOT} ${XDEBUG_MODE} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" -e typo3TestingAcceptanceBaseUrl=http://web:8000/ -e TYPO3_PATH_ROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance -e TYPO3_PATH_APP=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance ${IMAGE_PHP} php -S web:8000 -t ${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance >/dev/null
-          fi
         fi
         waitFor chrome 4444
         if [ "${ACCEPTANCE_HEADLESS}" -eq 0 ]; then
             waitFor chrome 7900
         fi
-        if [[ "${USE_APACHE}" -eq 1 ]]; then
-          waitFor web 80
-        else
-          waitFor web 8000
-        fi
+        waitFor web 80
         if [ "${ACCEPTANCE_HEADLESS}" -eq 0 ] && type "xdg-open" >/dev/null; then
             xdg-open http://localhost:7900/?autoconnect=1 >/dev/null
         elif [ "${ACCEPTANCE_HEADLESS}" -eq 0 ] && type "open" >/dev/null; then
@@ -523,12 +536,7 @@ case ${TEST_SUITE} in
                 ${CONTAINER_BIN} run --rm ${CI_PARAMS} --name mariadb-ac-${SUFFIX} --network ${NETWORK} -d -e MYSQL_ROOT_PASSWORD=funcp --tmpfs /var/lib/mysql/:rw,noexec,nosuid ${IMAGE_MARIADB} >/dev/null
                 DATABASE_IP=$(${CONTAINER_BIN} inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mariadb-ac-${SUFFIX})
                 waitFor mariadb-ac-${SUFFIX} 3306
-                if [[ "${USE_APACHE}" -eq 1 ]]; then
-                  CONTAINERPARAMS="-e typo3DatabaseName=func_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP}"
-                else
-                  # @todo Remove fallback when TF7 has been dropped (along with TYPO3 v11 support).
-                  CONTAINERPARAMS="-e typo3DatabaseName=func_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP} -e typo3TestingAcceptanceBaseUrl=http://web:8000"
-                fi
+                CONTAINERPARAMS="-e typo3DatabaseName=func_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP}"
                 ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name ac-mariadb ${XDEBUG_MODE} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" ${CONTAINERPARAMS} ${IMAGE_PHP} "${COMMAND[@]}"
                 SUITE_EXIT_CODE=$?
                 ;;
@@ -536,12 +544,7 @@ case ${TEST_SUITE} in
                 ${CONTAINER_BIN} run --rm ${CI_PARAMS} --name mysql-ac-${SUFFIX} --network ${NETWORK} -d -e MYSQL_ROOT_PASSWORD=funcp --tmpfs /var/lib/mysql/:rw,noexec,nosuid ${IMAGE_MYSQL} >/dev/null
                 DATABASE_IP=$(${CONTAINER_BIN} inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mysql-ac-${SUFFIX})
                 waitFor mysql-ac-${SUFFIX} 3306 2
-                if [[ "${USE_APACHE}" -eq 1 ]]; then
-                  CONTAINERPARAMS="-e typo3DatabaseName=func_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP}"
-                else
-                  # @todo Remove fallback when TF7 has been dropped (along with TYPO3 v11 support).
-                  CONTAINERPARAMS="-e typo3DatabaseName=func_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP} -e typo3TestingAcceptanceBaseUrl=http://web:8000"
-                fi
+                CONTAINERPARAMS="-e typo3DatabaseName=func_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP}"
                 ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name ac-mysql ${XDEBUG_MODE} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" ${CONTAINERPARAMS} ${IMAGE_PHP} "${COMMAND[@]}"
                 SUITE_EXIT_CODE=$?
                 ;;
@@ -549,29 +552,85 @@ case ${TEST_SUITE} in
                 ${CONTAINER_BIN} run --rm ${CI_PARAMS} --name postgres-ac-${SUFFIX} --network ${NETWORK} -d -e POSTGRES_PASSWORD=funcp -e POSTGRES_USER=funcu --tmpfs /var/lib/postgresql/data:rw,noexec,nosuid ${IMAGE_POSTGRES} >/dev/null
                 DATABASE_IP=$(${CONTAINER_BIN} inspect -f '{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' postgres-ac-${SUFFIX})
                 waitFor postgres-ac-${SUFFIX} 5432
-                if [[ "${USE_APACHE}" -eq 1 ]]; then
-                  CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_pgsql -e typo3DatabaseName=func_test -e typo3DatabaseUsername=funcu -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP}"
-                else
-                  # @todo Remove fallback when TF7 has been dropped (along with TYPO3 v11 support).
-                  CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_pgsql -e typo3DatabaseName=func_test -e typo3DatabaseUsername=funcu -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP} -e typo3TestingAcceptanceBaseUrl=http://web:8000"
-                fi
+                CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_pgsql -e typo3DatabaseName=func_test -e typo3DatabaseUsername=funcu -e typo3DatabasePassword=funcp -e typo3DatabaseHost=${DATABASE_IP}"
                 ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name ac-postgres ${XDEBUG_MODE} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" ${CONTAINERPARAMS} ${IMAGE_PHP} "${COMMAND[@]}"
                 SUITE_EXIT_CODE=$?
                 ;;
             sqlite)
                 rm -rf "${CORE_ROOT}/typo3temp/var/tests/acceptance-sqlite-dbs/"
                 mkdir -p "${CORE_ROOT}/typo3temp/var/tests/acceptance-sqlite-dbs/"
-                if [[ "${USE_APACHE}" -eq 1 ]]; then
-                  CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_sqlite"
-                else
-                  # @todo Remove fallback when TF7 has been dropped (along with TYPO3 v11 support).
-                  CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_sqlite -e typo3TestingAcceptanceBaseUrl=http://web:8000"
-                fi
+                CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_sqlite"
                 ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name ac-sqlite ${XDEBUG_MODE} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" ${CONTAINERPARAMS} ${IMAGE_PHP} "${COMMAND[@]}"
                 SUITE_EXIT_CODE=$?
                 ;;
         esac
         ;;
+    acceptanceComposer)
+        rm -rf "${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance-composer" "${CORE_ROOT}/.Build/Web/typo3temp/var/tests/AcceptanceReports"
+
+        PREPAREPARAMS=""
+        TESTPARAMS=""
+        case ${DBMS} in
+            mariadb)
+                ${CONTAINER_BIN} run --rm ${CI_PARAMS} --name mariadb-ac-${SUFFIX} --network ${NETWORK} -d -e MYSQL_ROOT_PASSWORD=acp -e MYSQL_DATABASE=ac_test --tmpfs /var/lib/mysql/:rw,noexec,nosuid ${IMAGE_MARIADB} >/dev/null
+                waitFor mariadb-ac-${SUFFIX} 3306
+                PREPAREPARAMS="-e TYPO3_DB_DRIVER=mysqli -e TYPO3_DB_DBNAME=ac_test -e TYPO3_DB_USERNAME=root -e TYPO3_DB_PASSWORD=acp -e TYPO3_DB_HOST=mariadb-ac-${SUFFIX} -e TYPO3_DB_PORT=3306"
+                TESTPARAMS="-e typo3DatabaseName=ac_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=acp -e typo3DatabaseHost=mariadb-ac-${SUFFIX}"
+                ;;
+            mysql)
+                ${CONTAINER_BIN} run --rm ${CI_PARAMS} --name mysql-ac-${SUFFIX} --network ${NETWORK} -d -e MYSQL_ROOT_PASSWORD=acp -e MYSQL_DATABASE=ac_test --tmpfs /var/lib/mysql/:rw,noexec,nosuid ${IMAGE_MYSQL} >/dev/null
+                waitFor mysql-ac-${SUFFIX} 3306
+                PREPAREPARAMS="-e TYPO3_DB_DRIVER=mysqli -e TYPO3_DB_DBNAME=ac_test -e TYPO3_DB_USERNAME=root -e TYPO3_DB_PASSWORD=acp -e TYPO3_DB_HOST=mysql-ac-${SUFFIX} -e TYPO3_DB_PORT=3306"
+                TESTPARAMS="-e typo3DatabaseName=ac_test -e typo3DatabaseUsername=root -e typo3DatabasePassword=acp -e typo3DatabaseHost=mysql-ac-${SUFFIX}"
+                ;;
+            postgres)
+                ${CONTAINER_BIN} run --rm ${CI_PARAMS} --name postgres-ac-${SUFFIX} --network ${NETWORK} -d -e POSTGRES_DB=ac_test -e POSTGRES_PASSWORD=acp -e POSTGRES_USER=ac_test --tmpfs /var/lib/postgresql/data:rw,noexec,nosuid ${IMAGE_POSTGRES} >/dev/null
+                waitFor postgres-ac-${SUFFIX} 5432
+                PREPAREPARAMS="-e TYPO3_DB_DRIVER=postgres -e TYPO3_DB_DBNAME=ac_test -e TYPO3_DB_USERNAME=ac_test -e TYPO3_DB_PASSWORD=acp -e TYPO3_DB_HOST=postgres-ac-${SUFFIX} -e TYPO3_DB_PORT=5432"
+                TESTPARAMS="-e typo3DatabaseDriver=pdo_pgsql -e typo3DatabaseName=ac_test -e typo3DatabaseUsername=ac_test -e typo3DatabasePassword=acp -e typo3DatabaseHost=postgres-ac-${SUFFIX}"
+                ;;
+            sqlite)
+                PREPAREPARAMS="-e TYPO3_DB_DRIVER=sqlite"
+                TESTPARAMS="-e typo3DatabaseDriver=pdo_sqlite"
+                ;;
+        esac
+
+        ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name acceptance-composer-prepare-${SUFFIX} ${XDEBUG_MODE} -e COMPOSER_CACHE_DIR=${CORE_ROOT}/.cache/composer -e COMPOSER_ROOT_VERSION=${COMPOSER_ROOT_VERSION} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" -e TYPO3=${TYPO3} ${PREPAREPARAMS} ${IMAGE_PHP} "${CORE_ROOT}/Build/Scripts/setupAcceptanceComposer.sh" ".Build/Web/typo3temp/var/tests/acceptance-composer"
+        SUITE_EXIT_CODE=$?
+        if [[ ${SUITE_EXIT_CODE} -eq 0 ]]; then
+            CODECEPION_ENV="--env ci,composer"
+            if [ "${ACCEPTANCE_HEADLESS}" -eq 1 ]; then
+                CODECEPION_ENV="--env ci,composer,headless"
+            fi
+            COMMAND=(.Build/vendor/codeception/codeception/codecept run Backend -d -c Tests/codeception.yml ${CODECEPION_ENV} "$@" --html reports.html)
+            SELENIUM_GRID=""
+            if [ "${ACCEPTANCE_HEADLESS}" -eq 0 ]; then
+                SELENIUM_GRID="-p 7900:7900 -e SE_VNC_NO_PASSWORD=1 -e VNC_NO_PASSWORD=1"
+            fi
+            APACHE_OPTIONS="-e APACHE_RUN_USER=#${HOST_UID} -e APACHE_RUN_SERVERNAME=web -e APACHE_RUN_GROUP=#${HOST_PID} -e APACHE_RUN_DOCROOT=${CORE_ROOT}/.Build/Web/typo3temp/var/tests/acceptance-composer/public -e PHPFPM_HOST=phpfpm -e PHPFPM_PORT=9000"
+            ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d ${SELENIUM_GRID} --name ac-chrome-${SUFFIX} --network ${NETWORK} --network-alias chrome --tmpfs /dev/shm:rw,nosuid,nodev,noexec ${IMAGE_SELENIUM} >/dev/null
+            if [ ${CONTAINER_BIN} = "docker" ]; then
+                ${CONTAINER_BIN} run --rm -d --name ac-phpfpm-${SUFFIX} --network ${NETWORK} --network-alias phpfpm --add-host "${CONTAINER_HOST}:host-gateway" ${USERSET} -e PHPFPM_USER=${HOST_UID} -e PHPFPM_GROUP=${HOST_PID} -v ${CORE_ROOT}:${CORE_ROOT} ${IMAGE_PHP} php-fpm ${PHP_FPM_OPTIONS} >/dev/null
+                ${CONTAINER_BIN} run --rm -d --name ac-web-${SUFFIX} --network ${NETWORK} --network-alias web --add-host "${CONTAINER_HOST}:host-gateway" -v ${CORE_ROOT}:${CORE_ROOT} ${APACHE_OPTIONS} ${IMAGE_APACHE} >/dev/null
+            else
+                ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d --name ac-phpfpm-${SUFFIX} --network ${NETWORK} --network-alias phpfpm ${USERSET} -e PHPFPM_USER=0 -e PHPFPM_GROUP=0 -v ${CORE_ROOT}:${CORE_ROOT} ${IMAGE_PHP} php-fpm -R ${PHP_FPM_OPTIONS} >/dev/null
+                ${CONTAINER_BIN} run --rm ${CI_PARAMS} -d --name ac-web-${SUFFIX} --network ${NETWORK} --network-alias web -v ${CORE_ROOT}:${CORE_ROOT} ${APACHE_OPTIONS} ${IMAGE_APACHE} >/dev/null
+            fi
+            waitFor chrome 4444
+            if [ "${ACCEPTANCE_HEADLESS}" -eq 0 ]; then
+                waitFor chrome 7900
+            fi
+            waitFor web 80
+            if [ "${ACCEPTANCE_HEADLESS}" -eq 0 ] && type "xdg-open" >/dev/null; then
+                xdg-open http://localhost:7900/?autoconnect=1 >/dev/null
+            elif [ "${ACCEPTANCE_HEADLESS}" -eq 0 ] && type "open" >/dev/null; then
+                open http://localhost:7900/?autoconnect=1 >/dev/null
+            fi
+            ADDITIONLPARAMS="-e TESTS_OUTPUT_PATH=../.Build/Web/typo3temp/var/tests_composer/AcceptanceReports -e TESTS_OUTPUT_PATH=../.Build/Web/typo3temp/var/tests_composer/_output"
+            ${CONTAINER_BIN} run ${CONTAINER_COMMON_PARAMS} --name ac-${DBMS}-composer-${SUFFIX} ${XDEBUG_MODE} ${ADDITIONLPARAMS} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" ${TESTPARAMS} ${IMAGE_PHP} "${COMMAND[@]}"
+            SUITE_EXIT_CODE=$?
+        fi
+        ;;
     cgl)
           # Active dry-run for cgl needs not "-n" but specific options
           if [ -n "${CGLCHECK_DRY_RUN}" ]; then
@@ -653,7 +712,7 @@ case ${TEST_SUITE} in
                 # create sqlite tmpfs mount typo3temp/var/tests/functional-sqlite-dbs/ to avoid permission issues
                 rm -rf "${CORE_ROOT}/.Build/Web/typo3temp/var/tests/functional-sqlite-dbs"
                 mkdir -p "${CORE_ROOT}/.Build/Web/typo3temp/var/tests/functional-sqlite-dbs/"
-                CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_sqlite --tmpfs ${CORE_ROOT}/.Build/Web/typo3temp/var/tests/functional-sqlite-dbs/:rw,noexec,nosuid"
+                CONTAINERPARAMS="-e typo3DatabaseDriver=pdo_sqlite --tmpfs ${CORE_ROOT}/.Build/Web/typo3temp/var/tests/functional-sqlite-dbs/:${TMPFS_MOUNT_OPTIONS}"
                 ${CONTAINER_BIN} run --rm ${CI_PARAMS} ${CONTAINER_COMMON_PARAMS} --name functional-${SUFFIX} ${XDEBUG_MODE} -e XDEBUG_CONFIG="${XDEBUG_CONFIG}" ${CONTAINERPARAMS} ${IMAGE_PHP} "${COMMAND[@]}"
                 SUITE_EXIT_CODE=$?
                 ;;
@@ -710,37 +769,5 @@ case ${TEST_SUITE} in
         ;;
 esac
 
-cleanUp
-
-# Print summary
-echo "" >&2
-echo "###########################################################################" >&2
-echo "Result of ${TEST_SUITE}" >&2
-if [[ ${IS_CORE_CI} -eq 1 ]]; then
-    echo "Environment: CI" >&2
-else
-    echo "Environment: local" >&2
-fi
-echo "Container runtime: ${CONTAINER_BIN}" >&2
-echo "Container suffix: ${SUFFIX}"
-echo "PHP: ${PHP_VERSION}" >&2
-if [[ ${TEST_SUITE} =~ ^(functional|functionalDeprecated|acceptance|acceptanceInstall)$ ]]; then
-    case "${DBMS}" in
-        mariadb|mysql|postgres)
-            echo "DBMS: ${DBMS}  version ${DBMS_VERSION}  driver ${DATABASE_DRIVER}" >&2
-            ;;
-        sqlite)
-            echo "DBMS: ${DBMS}" >&2
-            ;;
-    esac
-fi
-if [[ ${SUITE_EXIT_CODE} -eq 0 ]]; then
-    echo "SUCCESS" >&2
-else
-    echo "FAILURE" >&2
-fi
-echo "###########################################################################" >&2
-echo "" >&2
-
-# Exit with code of test suite - This script return non-zero if the executed test failed.
-exit $SUITE_EXIT_CODE
+# Cleanup, print summary && exit with exitcode
+printSummary
diff --git a/Build/Scripts/setupAcceptanceComposer.sh b/Build/Scripts/setupAcceptanceComposer.sh
new file mode 100755
index 00000000..e72a0a47
--- /dev/null
+++ b/Build/Scripts/setupAcceptanceComposer.sh
@@ -0,0 +1,91 @@
+#!/bin/sh
+
+#
+# Set up a composer-installed TYPO3 test instance for acceptance testing.
+# Called by runTests.sh -s acceptanceComposer.
+#
+# Creates symlinks so that Build/composer/composer.dist.json can reference
+# local paths with short names instead of deeply-nested relative URLs.
+# Mirrors the approach used in the TYPO3 core's setupAcceptanceComposer.sh.
+#
+
+set -e
+
+cd "$(dirname $(realpath $0))/../../"
+
+PROJECT_PATH=${1:-.Build/Web/typo3temp/var/tests/acceptance-composer}
+export TYPO3_DB_DRIVER=${TYPO3_DB_DRIVER:-sqlite}
+TYPO3_VERSION="${TYPO3:-14}"
+
+# Compute the relative path from PROJECT_PATH back to the project root.
+# e.g. ".Build/Web/typo3temp/var/tests/acceptance-composer" -> "../../../../../../"
+RELATIVE_ROOT=$(echo "${PROJECT_PATH}" | sed -e 's/[^\/][^\/]*/../g' -e 's/\/$//')
+
+mkdir -p "${PROJECT_PATH}"
+
+# b13-container -> project root   (provides the b13/container path repository)
+# packages      -> Build/tests/packages  (provides typo3tests/dataset-import)
+ln -snf "${RELATIVE_ROOT}" "${PROJECT_PATH}/b13-container"
+ln -snf "${RELATIVE_ROOT}/Build/acceptance_tests/packages" "${PROJECT_PATH}/packages"
+rm -f "${PROJECT_PATH}/composer.json"
+ln -snf "${RELATIVE_ROOT}/Build/acceptance_tests/composer.${TYPO3_VERSION}.json" "${PROJECT_PATH}/composer.json"
+rm -rf "${PROJECT_PATH}/config"
+mkdir -p "${PROJECT_PATH}/config/system/"
+ln -snf "${RELATIVE_ROOT}/../Build/sites" "${PROJECT_PATH}/config/sites"
+
+cd "${PROJECT_PATH}"
+
+rm -rf composer.lock public/ var/ vendor/
+
+cat > "config/system/additional.php" <<\EOF
+<?php
+$GLOBALS['TYPO3_CONF_VARS']['BE']['debug'] = true;
+// "Temporary Password - 123"
+$GLOBALS['TYPO3_CONF_VARS']['BE']['installToolPassword'] = '$argon2i$v=19$m=65536,t=16,p=1$c3hCMGVXOHhRd0M3MzhSVw$WPQHpElapKMxsxfSkkXw5YQxGKN+rGmjM8vQv3g79YY';
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['displayErrors'] = true;
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['devIPmask'] = '*';
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['exceptionalErrors'] = E_ALL;
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['errorHandlerErrors'] = E_ALL;
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = '.*';
+$GLOBALS['TYPO3_CONF_VARS']['GFX']['processor'] = 'GraphicsMagick';
+$GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport'] = 'mbox';
+$GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport_mbox_file'] = \TYPO3\CMS\Core\Core\Environment::getVarPath() . '/log/mail.mbox';
+EOF
+
+
+composer install --no-progress --no-interaction --dev
+
+TYPO3_SERVER_TYPE=apache \
+TYPO3_PROJECT_NAME="Container Test" \
+vendor/bin/typo3 setup --force --no-interaction
+
+echo "empty db"
+vendor/bin/typo3 dataset:empty-db
+
+echo "import fixtures"
+# Import acceptance test fixtures. vendor/b13/container symlinks back to the
+# project root via the b13-container path repository.
+FIXTURES="vendor/b13/container/Tests/Acceptance/Fixtures"
+vendor/bin/typo3 dataset:import "${FIXTURES}/be_users.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/be_groups.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/sys_workspace.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pages.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/contentDefenderMaxitems.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/contentTCASelectCtype.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/emptyPage.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-2.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-3.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-4.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-5.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-6.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithDifferentContainers.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithLocalization.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithLocalizationFreeModeWithContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithTranslatedContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithTranslatedContainer-2.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithWorkspace.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithWorkspace-movedContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithWorkspace-changedContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainerAndContentElementOutside.csv"
+echo "finished"
\ No newline at end of file
diff --git a/Build/acceptance_tests/README.md b/Build/acceptance_tests/README.md
new file mode 100644
index 00000000..d324686e
--- /dev/null
+++ b/Build/acceptance_tests/README.md
@@ -0,0 +1,8 @@
+### composer acceptance tests
+
+    cd Build/acceptance_tests
+    ./setup_local.sh
+    ./start_env.sh
+    php -d memory_limit=2G .Build/bin/codecept run Backend --env=local,localheadless,composer -c Tests/codeception.yml --fail-fast
+    php -d memory_limit=2G .Build/bin/codecept run Backend --env=local,localheadless,composer -c Tests/codeception.yml Tests/Acceptance/Backend/PageTsConfigModuleCest.php
+    ./stop_env.sh
\ No newline at end of file
diff --git a/Build/acceptance_tests/composer.13.json b/Build/acceptance_tests/composer.13.json
new file mode 100644
index 00000000..01cc756b
--- /dev/null
+++ b/Build/acceptance_tests/composer.13.json
@@ -0,0 +1,27 @@
+{
+    "repositories": [
+        {"type": "path", "url": "b13-container"},
+        {"type": "path", "url": "packages/*"}
+    ],
+    "require": {
+        "typo3/cms-backend": "^13.4",
+        "typo3/cms-frontend": "^13.4",
+        "typo3/cms-install": "^13.4",
+        "typo3/cms-fluid-styled-content": "^13.4",
+        "typo3/cms-info": "^13.4",
+        "typo3/cms-workspaces": "^13.4",
+        "b13/container": "@dev",
+        "ichhabrecht/content-defender": "*",
+        "typo3tests/dataset-import": "@dev",
+        "typo3/testing-framework": "^9.1",
+        "b13/container-example": "dev-master"
+    },
+    "config": {
+        "allow-plugins": {
+            "typo3/class-alias-loader": true,
+            "typo3/cms-composer-installers": true
+        }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
+}
diff --git a/Build/acceptance_tests/composer.14.json b/Build/acceptance_tests/composer.14.json
new file mode 100644
index 00000000..1b9d5b44
--- /dev/null
+++ b/Build/acceptance_tests/composer.14.json
@@ -0,0 +1,26 @@
+{
+    "repositories": [
+        {"type": "path", "url": "b13-container"},
+        {"type": "path", "url": "packages/*"}
+    ],
+    "require": {
+        "typo3/cms-backend": "^14.3",
+        "typo3/cms-frontend": "^14.3",
+        "typo3/cms-install": "^14.3",
+        "typo3/cms-fluid-styled-content": "^14.3",
+        "typo3/cms-info": "^14.3",
+        "typo3/cms-workspaces": "^14.3",
+        "b13/container": "@dev",
+        "typo3tests/dataset-import": "@dev",
+        "typo3/testing-framework": "^9.1",
+        "b13/container-example": "dev-master"
+    },
+    "config": {
+        "allow-plugins": {
+            "typo3/class-alias-loader": true,
+            "typo3/cms-composer-installers": true
+        }
+    },
+    "minimum-stability": "dev",
+    "prefer-stable": true
+}
diff --git a/Build/acceptance_tests/packages/dataset_import/Classes/Command/DatasetImportCommand.php b/Build/acceptance_tests/packages/dataset_import/Classes/Command/DatasetImportCommand.php
new file mode 100644
index 00000000..15dd2415
--- /dev/null
+++ b/Build/acceptance_tests/packages/dataset_import/Classes/Command/DatasetImportCommand.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TYPO3Tests\DatasetImport\Command;
+
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use TYPO3\TestingFramework\Core\Functional\Framework\DataHandling\DataSet;
+
+#[AsCommand('dataset:import', 'Import Dataset')]
+class DatasetImportCommand extends Command
+{
+    protected function configure(): void
+    {
+        $this->addArgument('path', InputArgument::REQUIRED, 'Path to CSV dataset to import');
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        DataSet::import($input->getArgument('path'));
+        return Command::SUCCESS;
+    }
+}
diff --git a/Build/acceptance_tests/packages/dataset_import/Classes/Command/EmptyDbCommand.php b/Build/acceptance_tests/packages/dataset_import/Classes/Command/EmptyDbCommand.php
new file mode 100644
index 00000000..1430075c
--- /dev/null
+++ b/Build/acceptance_tests/packages/dataset_import/Classes/Command/EmptyDbCommand.php
@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TYPO3Tests\DatasetImport\Command;
+
+use Symfony\Component\Console\Attribute\AsCommand;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use TYPO3\CMS\Core\Database\ConnectionPool;
+
+#[AsCommand('dataset:empty-db')]
+class EmptyDbCommand extends Command
+{
+    public function __construct(private readonly ConnectionPool $connectionPool, ?string $name = null, ?callable $code = null)
+    {
+        parent::__construct($name, $code);
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int
+    {
+        $connection = $this->connectionPool->getConnectionForTable('be_users');
+        $connection->truncate('be_users');
+        return Command::SUCCESS;
+    }
+}
diff --git a/Build/acceptance_tests/packages/dataset_import/Configuration/Services.yaml b/Build/acceptance_tests/packages/dataset_import/Configuration/Services.yaml
new file mode 100644
index 00000000..adae8cd8
--- /dev/null
+++ b/Build/acceptance_tests/packages/dataset_import/Configuration/Services.yaml
@@ -0,0 +1,8 @@
+services:
+  _defaults:
+    autowire: true
+    autoconfigure: true
+    public: false
+
+  TYPO3Tests\DatasetImport\:
+    resource: '../Classes/*'
diff --git a/Build/acceptance_tests/packages/dataset_import/composer.json b/Build/acceptance_tests/packages/dataset_import/composer.json
new file mode 100644
index 00000000..f5c4bc1e
--- /dev/null
+++ b/Build/acceptance_tests/packages/dataset_import/composer.json
@@ -0,0 +1,20 @@
+{
+	"name": "typo3tests/dataset-import",
+	"type": "typo3-cms-extension",
+	"description": "Support extension providing dataset:import command",
+	"license": "GPL-2.0-or-later",
+	"require": {
+		"typo3/cms-core": "^13.4 || ^14.3",
+		"typo3/testing-framework": "^9.1"
+	},
+	"extra": {
+		"typo3/cms": {
+			"extension-key": "dataset_import"
+		}
+	},
+	"autoload": {
+		"psr-4": {
+			"TYPO3Tests\\DatasetImport\\": "Classes/"
+		}
+	}
+}
diff --git a/Build/acceptance_tests/restart.sh b/Build/acceptance_tests/restart.sh
new file mode 100755
index 00000000..64382f33
--- /dev/null
+++ b/Build/acceptance_tests/restart.sh
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+./stop_env.sh && ./setup.sh && ./stop_env.sh
\ No newline at end of file
diff --git a/Build/acceptance_tests/setup.sh b/Build/acceptance_tests/setup.sh
new file mode 100755
index 00000000..2bac0543
--- /dev/null
+++ b/Build/acceptance_tests/setup.sh
@@ -0,0 +1,77 @@
+#!/bin/sh
+
+set -e
+
+export TYPO3_DB_DBNAME="bar"
+export TYPO3_DB_USERNAME="dev"
+export TYPO3_DB_PASSWORD="dev"
+export TYPO3_DB_HOST="127.0.0.1"
+export TYPO3_DB_DRIVER=mysqli
+export TYPO3_DB_PORT=3306
+export TYPO3_SERVER_TYPE=apache
+export TYPO3_PROJECT_NAME="Container Test"
+TYPO3_VERSION="${TYPO3:-14}"
+RELATIVE_ROOT="../../"
+PROJECT_PATH="."
+
+echo "drop database if exists ${TYPO3_DB_DBNAME};" |mysql
+echo "create database ${TYPO3_DB_DBNAME} DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;" |mysql
+
+
+ln -snf "${RELATIVE_ROOT}" "${PROJECT_PATH}/b13-container"
+
+rm -rf composer.lock config/ public/ var/ vendor/
+
+mkdir -p "config/system/"
+ln -snf "${RELATIVE_ROOT}sites" "${PROJECT_PATH}/config/sites"
+cat > "config/system/additional.php" <<\EOF
+<?php
+$GLOBALS['TYPO3_CONF_VARS']['BE']['debug'] = true;
+// "Temporary Password - 123"
+$GLOBALS['TYPO3_CONF_VARS']['BE']['installToolPassword'] = '$argon2i$v=19$m=65536,t=16,p=1$c3hCMGVXOHhRd0M3MzhSVw$WPQHpElapKMxsxfSkkXw5YQxGKN+rGmjM8vQv3g79YY';
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['displayErrors'] = true;
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['devIPmask'] = '*';
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['exceptionalErrors'] = E_ALL;
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['errorHandlerErrors'] = E_ALL;
+$GLOBALS['TYPO3_CONF_VARS']['SYS']['trustedHostsPattern'] = '.*';
+$GLOBALS['TYPO3_CONF_VARS']['GFX']['processor'] = 'GraphicsMagick';
+$GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport'] = 'mbox';
+$GLOBALS['TYPO3_CONF_VARS']['MAIL']['transport_mbox_file'] = \TYPO3\CMS\Core\Core\Environment::getVarPath() . '/log/mail.mbox';
+EOF
+
+cp "composer.${TYPO3_VERSION}.json" composer.json
+
+# `composer require` implicitly performs an initial install since there is no composer.lock.
+composer install --no-progress --no-interaction --dev
+vendor/bin/typo3 setup --force --no-interaction
+
+echo "empty db"
+vendor/bin/typo3 dataset:empty-db
+
+echo "import fixtures"
+# Import acceptance test fixtures. vendor/b13/container symlinks back to the
+# project root via the b13-container path repository.
+FIXTURES="vendor/b13/container/Tests/Acceptance/Fixtures"
+vendor/bin/typo3 dataset:import "${FIXTURES}/be_users.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/be_groups.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/sys_workspace.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pages.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/contentDefenderMaxitems.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/contentTCASelectCtype.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/emptyPage.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-2.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-3.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-4.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-5.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainer-6.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithDifferentContainers.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithLocalization.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithLocalizationFreeModeWithContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithTranslatedContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithTranslatedContainer-2.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithWorkspace.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithWorkspace-movedContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithWorkspace-changedContainer.csv"
+vendor/bin/typo3 dataset:import "${FIXTURES}/pageWithContainerAndContentElementOutside.csv"
+echo "finished"
\ No newline at end of file
diff --git a/Build/acceptance_tests/start_env.sh b/Build/acceptance_tests/start_env.sh
new file mode 100755
index 00000000..d0d2d082
--- /dev/null
+++ b/Build/acceptance_tests/start_env.sh
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+cp ../router.php public
+php -S 0.0.0.0:8080 -t public/ public/router.php & echo $! > var/php_pid
+chromedriver --url-base=/wd/hub  --port=9515 & echo $! > var/chromedriver_pid
\ No newline at end of file
diff --git a/Build/acceptance_tests/stop_env.sh b/Build/acceptance_tests/stop_env.sh
new file mode 100755
index 00000000..df0eeb90
--- /dev/null
+++ b/Build/acceptance_tests/stop_env.sh
@@ -0,0 +1,4 @@
+#!/bin/bash
+
+kill `cat var/php_pid`
+kill `cat var/chromedriver_pid`
\ No newline at end of file
diff --git a/Tests/Acceptance/Backend.suite.yml b/Tests/Acceptance/Backend.suite.yml
index bf4306fb..55bc2e4c 100644
--- a/Tests/Acceptance/Backend.suite.yml
+++ b/Tests/Acceptance/Backend.suite.yml
@@ -9,6 +9,10 @@ env:
     extensions:
       enabled:
         - B13\Container\Tests\Acceptance\Support\Extension\BackendContainerEnvironment
+  composer:
+    extensions:
+      enabled:
+        - B13\Container\Tests\Acceptance\Support\Extension\BackendContainerEnvironmentComposer
 
 groups:
   AcceptanceTests-Job-*: AcceptanceTests-Job-*
diff --git a/Tests/Acceptance/Backend/LayoutCest.php b/Tests/Acceptance/Backend/LayoutCest.php
index 860c0053..6d64b64e 100644
--- a/Tests/Acceptance/Backend/LayoutCest.php
+++ b/Tests/Acceptance/Backend/LayoutCest.php
@@ -57,6 +57,9 @@ public function connectedModeShowCorrectContentElements(BackendTester $I, PageTr
         $I->see('header-header-1', $languageCol . ' td.t3-grid-cell');
         $I->dontSee('2cols-header-0', $languageCol);
         $I->dontSee('header-header-0', $languageCol . ' td.t3-grid-cell');
+        // reset
+        $I->selectLayoutMode();
+        $I->selectEnglishInLanguageMenu();
     }
 
     public function connectedModeShowNoAddContentButton(BackendTester $I, PageTree $pageTree)
@@ -70,17 +73,13 @@ public function connectedModeShowNoAddContentButton(BackendTester $I, PageTree $
         // we have a "Content" Button for new elements with Fluid based page module
         $newContentElementLabel = $I->getNewContentElementLabel();
         $I->dontSee($newContentElementLabel, '#element-tt_content-102 .t3-page-ce-body');
-        if ($I->getTypo3MajorVersion() < 14) {
-            $I->selectOption('select[name="actionMenu"]', 'Language Comparison');
-        } else {
-            $I->waitForElementVisible('.module-docheader-buttons .btn-group button.dropdown-toggle');
-            $I->click('.module-docheader-buttons .btn-group button.dropdown-toggle');
-            $I->waitForElementVisible('.module-docheader-buttons .dropdown-menu');
-            $I->click('Language Comparison', '.module-docheader-buttons .dropdown-menu');
-        }
+        $I->selectLanguageComparisonMode();
         $I->waitForElementNotVisible('#t3js-ui-block');
         // but not in Language View
         $I->dontSee($newContentElementLabel, '#element-tt_content-102');
+        // reset
+        $I->selectLayoutMode();
+        $I->selectEnglishInLanguageMenu();
     }
 
     public function canCreateContainerContentElement(BackendTester $I, PageTree $pageTree)
@@ -214,7 +213,6 @@ public function canCreateContentElementInTranslatedContainerInFreeMode(BackendTe
         $uid = 104;
 
         $selector = '#element-tt_content-' . $uid . ' div:nth-child(1) div:nth-child(2)';
-        $I->dontSee('german', $selector);
         $dataColPos = $I->getDataColPos($uid, 200);
         $colPosSelector = '#element-tt_content-' . $uid . ' [data-colpos="' . $dataColPos . '"]';
         $I->clickNewContentElement($colPosSelector);
@@ -231,6 +229,8 @@ public function canCreateContentElementInTranslatedContainerInFreeMode(BackendTe
         $I->click('Close');
         $I->waitForElementNotVisible('#t3js-ui-block');
         $I->canSeeElement($selector . ' .t3js-flag[title="german"]');
+        // reset
+        $I->selectEnglishInLanguageMenu();
     }
 
     public function canTranslateChildWithTranslationModule(BackendTester $I, PageTree $pageTree, Scenario $scenario): void
@@ -241,8 +241,8 @@ public function canTranslateChildWithTranslationModule(BackendTester $I, PageTre
         $I->wait(0.2);
         $I->switchToContentFrame();
 
-        $I->selectLanguageComparisonMode();
         $I->selectGermanInLanguageMenu();
+        $I->selectLanguageComparisonMode();
         if ($I->getTypo3MajorVersion() < 14) {
             $I->waitForElementVisible('a.t3js-localize');
             $I->click('a.t3js-localize');
@@ -254,9 +254,15 @@ public function canTranslateChildWithTranslationModule(BackendTester $I, PageTre
         $I->switchToIFrame();
         if ($I->getTypo3MajorVersion() < 14) {
             $I->waitForText('(212) headerOfChild');
+            $I->click('button.t3js-modal-close');
         } else {
             $I->waitForText('headerOfChild');
+            $I->click('button.modal-header-close');
         }
+        $I->switchToContentFrame();
+        // reset
+        $I->selectLayoutMode();
+        $I->selectEnglishInLanguageMenu();
     }
 
     public function canTranslateChild(BackendTester $I, PageTree $pageTree): void
diff --git a/Tests/Acceptance/Backend/WorkspaceCest.php b/Tests/Acceptance/Backend/WorkspaceCest.php
index bc4080d5..5f0ba1ab 100644
--- a/Tests/Acceptance/Backend/WorkspaceCest.php
+++ b/Tests/Acceptance/Backend/WorkspaceCest.php
@@ -69,6 +69,7 @@ public function liveWorkspaceShowsLiveElementsForTranslations(BackendTester $I,
         $I->waitForText('translation-live');
         $I->see('translation-live');
         $I->dontSee('translation-ws');
+        $I->selectEnglishInLanguageMenu();
     }
 
     #[Group('workspace')]
@@ -84,6 +85,8 @@ public function testWorkspaceShowsLiveElementsForTranslations(BackendTester $I,
         $I->dontSee('translation-live');
         $I->see('translation-ws');
         $this->switchToLiveWs($I);
+        $I->switchToContentFrame();
+        $I->selectEnglishInLanguageMenu();
     }
 
     #[Group('workspace')]
diff --git a/Tests/Acceptance/Support/BackendTester.php b/Tests/Acceptance/Support/BackendTester.php
index 2b8cfc49..651d47a4 100644
--- a/Tests/Acceptance/Support/BackendTester.php
+++ b/Tests/Acceptance/Support/BackendTester.php
@@ -127,6 +127,22 @@ public function selectGermanInLanguageMenu(): void
         }
     }
 
+    public function selectEnglishInLanguageMenu(): void
+    {
+        if ($this->getTypo3MajorVersion() < 14) {
+            $this->waitForText('Language');
+            $this->click('Language');
+            $this->waitForText('english');
+            $this->click('english');
+        } else {
+            $this->waitForText('german');
+            //$this->click('english');
+            $this->click('.module-docheader-column button.dropdown-toggle');
+            $this->waitForText('english');
+            $this->click('english');
+        }
+    }
+
     public function selectLanguageComparisonMode(): void
     {
         if ($this->getTypo3MajorVersion() < 14) {
@@ -139,4 +155,17 @@ public function selectLanguageComparisonMode(): void
             $this->click('Language Comparison', '.module-docheader-buttons .dropdown-menu');
         }
     }
+
+    public function selectLayoutMode(): void
+    {
+        if ($this->getTypo3MajorVersion() < 14) {
+            $this->waitForElement('select[name="actionMenu"]');
+            $this->selectOption('select[name="actionMenu"]', 'Layout');
+        } else {
+            $this->waitForElementVisible('.module-docheader-buttons .btn-group button.dropdown-toggle');
+            $this->click('.module-docheader-buttons .btn-group button.dropdown-toggle');
+            $this->waitForElementVisible('.module-docheader-buttons .dropdown-menu');
+            $this->click('Layout', '.module-docheader-buttons .dropdown-menu');
+        }
+    }
 }
diff --git a/Tests/Acceptance/Support/Extension/BackendContainerEnvironmentComposer.php b/Tests/Acceptance/Support/Extension/BackendContainerEnvironmentComposer.php
new file mode 100644
index 00000000..cd1d6792
--- /dev/null
+++ b/Tests/Acceptance/Support/Extension/BackendContainerEnvironmentComposer.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace B13\Container\Tests\Acceptance\Support\Extension;
+
+/*
+ * This file is part of TYPO3 CMS-based extension "container" by b13.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ */
+
+class BackendContainerEnvironmentComposer extends \Codeception\Extension
+{
+}
diff --git a/Tests/codeception.yml b/Tests/codeception.yml
index defe5aff..e3a7604a 100644
--- a/Tests/codeception.yml
+++ b/Tests/codeception.yml
@@ -2,9 +2,9 @@ namespace: B13\Container\Tests\Acceptance\Support
 paths:
   tests: Acceptance
   data: .
-  log: ../.Build/Web/typo3temp/var/tests/AcceptanceReports
+  log: '%TESTS_LOG_PATH%'
   support: Acceptance/Support
-  output: ../.Build/Web/typo3temp/var/tests/_output
+  output: '%TESTS_OUTPUT_PATH%'
 settings:
   colors: true
   memory_limit: 1024M
@@ -55,6 +55,13 @@ env:
           capabilities:
             goog:chromeOptions:
               args: ["no-sandbox", "disable-gpu"]
+  localheadless:
+    modules:
+      config:
+        WebDriver:
+          capabilities:
+            goog:chromeOptions:
+              args: ["headless", "no-sandbox", "disable-gpu"]
 params:
   - parameters.yml
   - env
diff --git a/Tests/parameters.yml b/Tests/parameters.yml
index 438ada0b..d6749229 100644
--- a/Tests/parameters.yml
+++ b/Tests/parameters.yml
@@ -3,4 +3,6 @@
 # These values can be overridden by environment variables,
 # e.g. in Build/Scripts/runTest.sh
 #
-typo3TestingAcceptanceBaseUrl: http://web:80
\ No newline at end of file
+typo3TestingAcceptanceBaseUrl: http://web:80
+TESTS_LOG_PATH: ../.Build/Web/typo3temp/var/tests/AcceptanceReports
+TESTS_OUTPUT_PATH: ../.Build/Web/typo3temp/var/tests/_output
\ No newline at end of file