It has extensions support on mobile. I can’t live without uBlock Origin. I installed Firefox on PC because of synching between Firefox on PC and Firerox and Android. I now stopped using this feature, but I kept using Firefox. I only use Chrome when pages don’t open correctly on Firefox.
I don’t mind paying ~1300€ for a new phone, if that phone meets my need. I know it’s a little bit too much according to how much would other people spend, but if I can get more stuff done with that phone, I think it’s money well spent.