Additional check for people with different language pack in firefox

[Unknownpony]

I have added simple additional check for people with different firefox language pack. After first check will return null as element, it check for first combobox element and then edit element (which should be url search bar unless someone have additional toolbars but usually additional toolbars are below urls).

[PiMaker]

Main feature no longer needed with browser plugin. Voice Control sounds nice, but if you really want it merged make it it's own PR please :)