I'd be much more interested in what you think personally, than what "a consumer" might think. I'm perfectly aware that a lot of the things that matter to me, doesn't seem to matter to a lot of people. Do I understand you correctly, in that:
1) You use gmail and Google calendar, therefore
2) You want your passwords, extensions, bookmarks and browser history synced by the same provider that provides your email and calendar hosting
3) You don't care if you can never (reasonably) move away from that provider
For you, Firefox would be as nice as Chrome, if: Firefox provided free/cheap (web)email and calendar hosting in addition to the sync services? Or if a third party offered paid hosting for Firefox sync along with (web+imap+smtp) email and calendar (ical) services? (Sounds like something fastmail should consider..?)
I'm not trying to be snarky, I just genuinely want to know in what way you think Firefox could (should) improve -- it sounds like the only thing missing is more services hosted under a single login?