Not sure if this is “that one extension”, but I use Simple Tab Groups for Workspaces-like functionality, similar to Edge and Vivaldi. I know, it isn't tab groups, but I use it similarly.
dinozaur
joined 9 months ago
There's Live Bookmarks extensions for Chromium and Firefox
FF: Live Marks Chromium: Live RSS Bookmarks
I had seedboxes.cc for a while. They were great, but a bit expensive. If I could do it over, I'd probably get ultra.cc. Currently, I'm looking at torbox.app, but they're not exactly a seedbox.