The lack of tab groups on Firefox is a major lapse in their product planning. It's an essential feature and the reason I use chromium-based browsers at my job rather than Firefox.

I've tried the add-ons that attempt to workaround this fundamental lack of tab management issue (Sidebery, Tree Style Tab, OneTab, etc.), and none of them function like tab groups in chromium.

Also, the incessant Firefox crashes on Linux with nvidia drivers when one has hardware acceleration enabled has me often wonder why I bother being ride-or-die with Firefox. (Then again, nvidia drivers f up many a thing on Linux, except chromium apparently)