No, there's no tab grouping on Firefox for Android. I have not found an extension that works for mobile for that functionality either.
this post was submitted on 26 Oct 2023
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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/.