If you're switching a couple extensions are uBlock origin and no script with Firefox, prevents most ads and lets you choose which hosts to accept JavaScript from temporarily or permanently.
Firefox add-on for Tab Groups? I looked and couldn't find one. At some point they appeared to try to support tab groups, but gave up? I dunno. I've only used Chrome a little. I don't personally care for Chrome, but I found the tab groups useful.
I just searched "tab groups Firefox" and found results saying it has them. No idea as I wasn't able to find relevant settings last time I tried on a PC. Mobile just now I tried adding tabs to a collection, but it doesn't look like it did anything