Seconded. It's great - old Firefox for Android was clunky and slow. The new one I am using as my primary browser with full sync enabled and with uBlock Origin and NoScript and apart from the occasional crash (they seem to fix it quick) it's great.
I was using it with old Firefox for Android too, just that it was too slow and clunky compared to the new rewritten Firefox for Android, which being a complete rewrite in Kotlin, only recently started supporting extensions.