i just upgraded from Firefox 61 -> 62 on macOS 10.13.6. version 62 fails to respect custom keyboard mappings (stored in ~/Library/KeyBindings/DefaultKeyBinding.dict). in all previous versions of Firefox that i have used custom keyboard mappings have worked, just broke in version 62. i have tested this on two machines running macOS 10.13.6 going from FF 61 -> 62. this appears to be an old bug that has resurfaced. please see: https://bugzilla.mozilla.org/show_bug.cgi?id=282097 https://bugzilla.mozilla.org/show_bug.cgi?id=918859 https://bugzilla.mozilla.org/show_bug.cgi?id=308824