I would simply use autohotkey: ^{Right}::Send ^{Tab} ^{Left}::Send ^+{Tab} But then, that changes behavior for all applications, not just Firefox. Th

I would simply use autohotkey: ^{Right}::Send ^{Tab} ^{Left}::Send ^+{Tab} But then, that changes behavior for all applications, not just Firefox. There is a keyconfig extension for Firefox: http://kb.mozillazine.org/Keyconfig_extension http://kb.mozillazine.org/Keyconfig_extension you could try that. In Opera it is easy. Personally, I have this functionality under 'j' and 'k'.