Hi! After your comment, I though a lot about it. I’m currently working on a solution to work with Firefox Color but at the same time to avoid using unreadable colors from bad/incomplete themes.

Currently, it falls back to the default theme if the theme will *probably* be usable by this extension (there is a lot of problematic themes and it’s hard to know if they will work badly with Tab Center Reborn). This will change to a better algorithm so it will work perfectly with Firefox Color but I’m still not sure how to notify the user that their theme is not usable because I don’t want to be intrusive but I don’t want the users to think that my extension is buggy either.

So yeah, that’s being worked on, but that’s tricky to make it work perfectly well for every users without being annoying or confusing.