Apparently, some very popular extensions still have problems with it. The one that bother me the most is tab group: https://github.com/Quicksaver/Tab-Groups/i

Apparently, some very popular extensions still have problems with it. The one that bother me the most is tab group: https://github.com/Quicksaver/Tab-Groups/issues/535 https://github.com/Quicksaver/Tab-Groups/issues/535 It was an feature of Firefox that I loved. They removed it. So I now use the extension. And the author is now announcing he won't be able to port it.