As a practical matter, my experience of using FirefoxOS everyday is that performance is not the main issue. Of course it could undoubtedly be improved, but it's

As a practical matter, my experience of using FirefoxOS everyday is that performance is not the main issue. Of course it could undoubtedly be improved, but it's acceptable, particularly once you put it onto reasonable hardware (i.e. not the $40 phones). Much more problematic is the lack of "premium content" i.e. services that — even if they are basically just webapps — don't work except on Android/iOS. This is a particularly vicious cycle; it's hard to convince anyone to put in the effort to support minority platforms, and it's hard to get users unless you support the same content as other platforms (see also: Windows Phone, which by all accounts is an excellent product that almost no one uses). There's also the fact that FirefoxOS is some years behind the other platforms in terms of developers and the competition has ~infinite resources, which means that some parts are lagging behind feature wise. Having said all of that, I don't think that Opera is a bad analog for the difficulties FirefoxOS faces, only it's not Opera Platform specifically but Presto in general. It had the same kind of issues with limited support from content creators and relatively available resources.