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Precisely their point: users don’t necessarily mean sales, but they MIGHT bring in donors.
Your argument boils down to “but Mac’s HIG isn’t perfect and UX/UI criticism is nitpicking”. OP is right though, UI/UX matters and despite Mac’s HIG being a mess, it is the Mac’s mess and users expect a Mac-like mess, Firefox should not be taking things into its own hands either way.
It quite literally isn’t.
> They are not “available on Android, iPhone, iPad and Apple Watch”.

No. They are available on the “Play Store” and the “App Store”. OSs are rarely mentioned. Store tags only feature store logos and store names, for device specific ones you get the device itself. The OS remains irrelevant in this scenario.