> I am also a happy FireFox user, but recently I have found a growing number of websites that won't even let you use their functionality unless you are using Chrome or Safari
This seems unlikely as FireFox user share was bigger then Chrome until recently and is much bigger then Safari. Except for Mobile, where I think the dominance of Android/ios has led to a lot of use of webkit specific features.
It's not that unlikely when Google is the author of some of these sites, sadly. At this point they seem to have a policy of writing Chrome-specific things first and then maybe making it work in other browsers and maybe not.
This seems unlikely as FireFox user share was bigger then Chrome until recently and is much bigger then Safari. Except for Mobile, where I think the dominance of Android/ios has led to a lot of use of webkit specific features.