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CloseQuick Locale Switcher 2 0.0.1 Requires Restart
by ChoGGi
Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.
About this Add-on
Possibly this one will be compatible sometime in the future:
https://github.com/nohamelin/simple-locale-switcher/issues/16
Autoswitch isn't working at the moment (mostly fixed, but still having some issues with multi process Firefox).
Hopefully the same as Quick Locale Switcher, but less buggy.
https://addons.mozilla.org/addon/quick-locale-switcher
This is a fork of QLS, since it seems to be quite dead (developer wise).
If you wish to have the flag show up in the statusbar you'll need to install
https://addons.mozilla.org/addon/status-4-evar/
Otherwise there is a toolbar button, or a menu in the Tools menu.