Mozilla last week shut down Firefox's support for Windows XP and Windows Vista, ending browser security updates for the outdated operating systems.

"It required effort, and it required devoting resources to supporting XP well after Microsoft stopped doing so," Chris Hutten-Czapski, a Firefox engineer, said in a Sept. 5 post to his personal blog. "It meant we couldn't do other things, since we were busy with XP."

[ Further reading: 14 must-have Firefox add-ons ]

Support for the two past-expiration-date OSes – Microsoft dropped Windows XP in April 2014, Vista in April 2017 – ended with Firefox ESR 52.9, which was released June 26. That version was supplanted by Firefox ESR 60.2 on Sept. 4.

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