Firefox 43.0.4
https://www.mozilla.org/en-US/firefox/43.0.4/releasenotes/
Fixed
Fix for startup crash for users of a third party antivirus tool (Bug 1235537)
Multi-user GNU/Linux download folders can be created (Bug 1233434)
Changed
Re-enable SHA-1 certificates (Bug 1236975)
Available via the internal updater: Help/About Firefox