Mozilla released the next major update for Firefox on January 26th with Firefox 44. New features in this release included: Improved warning pages for certificate errors and untrusted connections Enable H.264 if system decoder is available Enable WebM/VP9 video support on systems that don’t support MP4/H.264 In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread Support the brotli compression format via HTTPS content-encoding Screenshot commands allow user choice of pixel ratio in Developer Tools Firefox Can Now Get Push Notifications From Your Favorite Sites There were some fixes and other items in this release…
Firefox 44
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Bug 1203584 was filed on September 10th, 2015 indicates Mozilla has delay the enforced extension signing (unsigned add-ons can not be installed…period) until Firefox 44 coming in late January 2016. This means that unsigned add-ons may still be installed in Firefox 41-43 if you set the xpinstall.signatures.required preference in about:config to FALSE. Not sure as to the reason for this change as the bug simply stated: We’ve decided to push turning the pref for signing requirements on out to 43 so need to turn it off in aurora/beta. Forcing the pref on will be pushed out to 44