No, there's no tab grouping on Firefox for Android. I have not found an extension that works for mobile for that functionality either.
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Firefox on mobile does have something called Collections. It's not a tab group, but like a group of bookmarks you can save.
I wish, one of the features I miss from Chrome.
Maybe Fennec (a Firefox fork that lets you install desktop add-ons) and this https://addons.mozilla.org/en-US/firefox/addon/simple-tab-groups/.
You can't even sort them...
I don't think there's auto sort but you can manually rearrange them.
Wow. For how long? Must be new ๐
Edit: you may onky rearrange normal tabs. I'm always on private tabs where you can't rearrange them
For a bit now, press+hold the tab you want to move and it'll let you do it.
Not in private tabs...
At least a year, been there since I migrated
Not in private tabs...
Oh, well dang, that's kinda dumb