[int_19h]

If you use any kind of browser sync, that alone makes the choice of browser important, since you need the same one on all devices that you use for it to work seamlessly across all of them.

(I wish we had standardized sync protocols for this stuff. But we couldn't even standardize IM, so that's just futile dreaming on my part.)

[mackrevinack]

i havnt got around to trying floccus out fully but i hope its good because i switch between firefox and vivaldi every few years so it would be nice to have something that would work on both

https://floccus.org/

[TingPing]

Firefox Sync is somewhat open. The service is foss and third-party browsers implement it.

[sph]

Which third party browsers? Epiphany does, but it's not a very good browser, sad to say, and pretty much noone uses it.

[TingPing]

Epiphany and Eolie.

I guess your point is Mozilla would care if they were bigger. Nobody can say. The service documents you are allowed to use it as long as you don't use Firefox/Mozilla branding.