Yep. There's one that bit me recently, where Esc key was previously able to stop GIF animations, and was very handy. Apparently, this behaviour was considered

Yep. There's one that bit me recently, where Esc key was previously able to stop GIF animations, and was very handy. Apparently, this behaviour was considered a bug, if a very long-lived one. So a recent update 'fixed' that behaviour, although the justification is stronger there, and the workaround (SuperStop addon[2]) is actually useful, although still on a different keybind (Shift-Esc) [1] https://bugzilla.mozilla.org/show_bug.cgi?id=825486 https://bugzilla.mozilla.org/show_bug.cgi?id=825486 [2] https://addons.mozilla.org/en-US/firefox/addon/superstop/ https://addons.mozilla.org/en-US/firefox/addon/superstop/