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Firefox 52 Is The Last Version of Firefox For Windows XP and Vista (mspoweruser.com)
Mozilla has confirmed that Firefox 52, the new version of its browser it made available earlier this week, will be the last major version to support two legacy operating systems - Windows XP and Windows Vista. The company said future versions will require Windows users to be on a machine that has at a minimum Windows 7 running on it.
Sometimes dropping support is not because it won't work, but because the cost/benefit ratio of testing to guarantee it will work is not worth the effort.
Pertinent facts:
Vista represents less than 1% of the market, we're talking 3 to 4 times less than linux
Vista exited mainstream support FIVE YEARS AGO
Vista extended support expires this week
At some point you just stop beating the dead horse.
XML is a known as a key material required to create SMD: Software of Mass Destruction
I think you are talking about the Pale Moon project. They claim to have no intention of dropping old-school NPAPI plugins and whatnot.
Win 10 runs even better than Vista did on the old hardware -- due in part to streamlining the OS to fit on low-resource PCs to compete with tablets and Chromebooks. Win 10 loads things more intelligently, uses RAM compression, and tries to only load one copy of a cached shared library instead of multiples - one for each app using them. If it weren't for the spyware, adware, and cost, It'd be a decent OS.
I put Ubuntu on our 8 year old Vista machine, but only because it wasn't worth purchasing a Win 10 license.