Next up: Shipping Electrolysis ( e10s), the long-overdue update to desktop Firefox that will allow it to use multiple threads/processes, like Chrome.Last month, Mozilla Engineering Manager Benjamin Smedberg quietly announced that the 64-bit version of Firefox for Windows would never see the light of day. Well done Mozilla: that's one big headache finally out of the way.

Today, though, with the release of Firefox 43, it has actually happened. In 2014 Mozilla confirmed that a stable build of 64-bit Firefox for Windows was finally on its way, with a planned release of 'before the end of 2015.' It looked like Mozilla was on target for a 64-bit version of Firefox 41, which was released in September, but alas it wasn't to be. Back in 2012 an executive decision was made to halt 64-bit builds entirely due to 'significant negative feedback' and a frustrating user and tester experience-but a few months later that decision was reversed and the 64-bit builds continued, albeit very quietly.

Over the years there have been a number of unofficial and alpha/beta builds of 64-bit Firefox for Windows, but they've always been aborted before they made it to the stable release channel.

64 bit firefox for windows 10