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by augustl 4322 days ago
Not op, but I just use the built-in one. On OS X, press CMD+shift+e and you'll get a overview of tab groups, you can create new groups, etc. I have a "main" group (the default one) and one group per pet project, subject, etc. I tend to use these instead of bookmarks, since they stay around even if the browser crashes.
1 comments

Tab Groups are great. Its one of my favorite Firefox features.