Not sure about changing the look, but tree tabs are super useful if you often find yourself with a bazillion tabs open.
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If you use gnome, you may want to use gtk https://github.com/rafaelmardojai/firefox-gnome-theme
Maybe you like this https://github.com/Godiesc/firefox-one
Thank you! I am on Sway but I'll take a look at this. I didn't know there were premade userChrome themes. This is awesome
If you've got too much time https://firefoxcss-store.github.io/ I don't endorse it since themes can be buggy.
Gtk theme is working perfectly fine without any bugs in my experience
CustomCSSforFx comes with a bunch of options for tab style.
Thank you! This looks great. I'll give it a try