Aww, too bad
I see a comment inbox but can’t see here. I’m pasting it here
I switched to the fork as soon as I read this news. It shouldn’t take more than a few minutes:
Just install it in parallel with the mainline app,
export your existing configuration to the default storage location, import it in syncthing-fork (it’ll detect the export file automatically),
and you’re done. Uninstall the official app so they don’t compete for the daemon and port.
I switched to firefox-esr and will be happy to wait for tab groups and vertical tabs in the June/July version.