@Gargron I had been using the Mozilla line of browsers since Netscape 2, but when Netscape became an unusable blob, I switched to Opera. I went back to Firefox at some point in the late 00s when too many websites didn't work with Opera anymore (which at that time used its own engine), but when a couple of add-ons I used a lot weren't developed for FF anymore in the late 10s, I switched to Chrome where they were still available. They have been rewritten for FF in the meantime, but I always stick to the browser I'm currently using until continuing to use it gets more painful than copying all the addresses for the gazillion tabs in my session from one browser to the other.
Besides, is there a good tab manager for FF that can work with tab groups like Chrome?