Been using firefox for almost 20 years. With their seeming lack of interest on mobile (scroll through this active post and see all the "this is the only feature mobile firefox lacks for me to switch" over years), and the direction the desktop changes are going I may be looking for another browser in the not too distant future. Been a great run so far Mozilla, and this feature alone would keep me as a user for years longer.
Firefox Mobile really needs tab groups. Pretty much every other browser has this. Please tell us the team is working on it. This is really a basic feature for browsers.
Came to say I am using only FF on desktop since 2007/2008, but I would also appreciate if the Android version had tab groups. A very dearly missed feature indeed.