Filenames unreadable when using octotree

[JonnoFTW]

What's the issue:

Filenames in the octotree filebrowser extension are not clearly visible.

Steps to reproduce:

1. Install octotree plugin
2. Visit any repository

Solutions:

Add a a.jstree-anchor and a.jstree-hovered style. Didn't work though.

What version is affected by this problem:

@name           GitHub Dark v2.6.3
@namespace      github.com/cquanu/github-dark
@version        2.6.24

[snowe2010]

Octotree continually changes their tags to force you to pay for their dark mode. I don't think I'll be able to fix this, but I can try to force it back to light mode.