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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
The active tab needs to be a little more distinct but damn the new libadwaita redesign looks amazing, I'll probably switch to GNOME when version 42 releases.
So, is this an optional, third-party theme? Or will this be how Firefox looks on GNOME by default?
It's a third party theme. Firefox uses GTK as it's toolkit but almost all of the browser is styles through html/css, this theme replaces most of the browser with GTK styling instead.
Ah, now I gotta nitpick you on your Firefox facts.
Firefox mostly uses the XUL/XPCOM toolkit, which was written by Mozilla. It only references the GTK theme for how it should theme itself, and it makes use of the GTK file picker.
XUL code is rather similar to HTML, so one can also use CSS to style it, which is what this theme does to make it look more like a GNOME application.
Thanks for explaining, I wasn't sure how it worked inside but I thought I knew the basic idea.