Firefox 37

Firefox 37 was released on March 31, 2015, bringing a heartbeat user rating system, which provides user feedback about the Firefox, and improved protection against website impersonation via OneCRL centralized certificate revocation. Also, Bing search is changed to use HTTPS for secure searching, and added is support for opportunistic encryption of the HTTP traffic where the server supports HTTP/2's AltSvc feature.

Firefox 37.0.1 was released on April 3, 2015 for desktop and Android, fixing security issues and several crash issues. It also disabled opportunistic encryption of the HTTP traffic introduced in 37.0.

Firefox 37.0.2 was released for Android only on April 14, 2015, fixing a issue about Request Desktop Site feature.