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Tab Groups like Chrome
(lemmy.world)
A place to discuss the news and latest developments on the open-source browser Firefox
Not a direct answer I'm afraid but I use Tree Style Tabs. You can group tabs (in a subtree), move them to other windows (drag and drop), close them together, ... It's helped me a lot keep my browser tabs tidy and grouped up by relevance.
In this vein there's also Simple Tab Groups which I use. Especially useful IMO if you have distinct groups for different projects