Everyone should have this. Allows so much more then the generic white/black/grey/red themes I otherwise see on other browsers.

Just wanted my blk/wht scheme back. Accidentally lost it so this was cool. Maybe I'll play with colors more, I dunno.

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Gotta love this add-on. I always make FF match my current Windows theme, something unable to achieve in other browsers. Mmm consistency.

I've love this addon. There are some weird issues since the Firefox 89 update though.

The standard "System theme" is supposed to "Follow the operating system setting for buttons, menus, and windows" yet in Firefox 89 it no longer does so. This extension lets me at least manually set Firefox colours to match the OS theme, and visually differentiate between active and inactive Firefox windows.

It's straightforward to use. You can, in real-time, customise the colours of Firefox. It's faster than having to sift through the ugly themes available elsewhere.