Add keyboard shortcuts for almost all keys on the Radio France player(s).
The shortcuts are:
Left arrow -> -10s
Space -> Pause
Right arrow -> +10s
Up arrow -> Increase volume
Down arrow -> Decrease volume
Should work for every radio, except "Mouv'" that, for now, has some malfunctionning buttons.
Get it for firefox: https://addons.mozilla.org/en-US/firefox/addon/radio-france-ultimate