October 4, 20178 yr I happened to stumble across some links in Mozilla's FTP, and came across some Firefox builds that were never officially released. For example, I downloaded the ZIP file for US English Firefox 45.9.1; I believe the final public release was 45.9.0 because I couldn't find the release notes for 45.9.1. I wonder why 45.9.1 wasn't officially released. Firefox ESR 45.x is unique as it is the final ESR to run on SSE only processors such as the Pentium/Pentium II/Pentium III. http://bucketlister-delivery.prod.mozaws.net/pub/firefox/tinderbox-builds/mozilla-esr45-win32/ In there, the very first build is 45.0: http://bucketlister-delivery.prod.mozaws.net/pub/firefox/tinderbox-builds/mozilla-esr45-win32/1456425508/ The last build: http://bucketlister-delivery.prod.mozaws.net/pub/firefox/tinderbox-builds/mozilla-esr45-win32/1497368434/ You can find the other earlier/later builds here: http://bucketlister-delivery.prod.mozaws.net/pub/firefox/tinderbox-builds/ You'll notice I have deliberately spoofed the user agent for Firefox 52, so I don't get silly messages that my browser is out of date.
October 4, 20178 yr > SSE only processors such as the Pentium/Pentium II/Pentium III Of those three processor families, only the Pentium III has SSE support.
October 5, 20178 yr Author @dencorso @jumper I stand corrected. I think I might have been thinking of MMX support, which was first seen with the later 1996 Pentiums. So, I think this means that Firefox 3.6.28 was the final version for the Pentium and Pentium II: (https://web.archive.org/web/20120525091229/http://www.mozilla.org/en-US/firefox/3.6/system-requirements/)
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