Apologies in advance if this is not the correct forum for this sort question.
I maintain Manjaro themed version of Adwaita-theme, Adwaita-maia. It’s basically just Adwaita with only selected_bg_color altered in scss file. In most applications this produces the desired effect, and the text highlight color is changed to match the green theme color. However, there is one exception to this rule: Firefox highlights text with the stock blue of Adwaita.
It used to use my green, but something changed and I’m not sure what. I’m using a custom css to make Firefox look like a gnome app, but the color is not set there. Downgrading Firefox or the theme does not seem to have an effect. But if I use another gtk theme like matcha-sea, the highlight color changes. So I figured that the problem is likely with Adwaita-maia. It might also be a Firefox issue, but since it works with other gtk themes I find it less likely.
If anyone can give me any pointers on where to start troubleshooting this or where Firefox might be picking its color from, I would appreciate it greatly. Thank you very much for your time!
EDIT: To further narrow down the issue, tested the theme without the firefox theme applied. This had no effect on the issue.