new at this. not real framilair with cpmputers

Какой смысл держать и обновлять это дополнение, если оно не работает с актуальными версиями файрфокса...

ok

I have installed this extension on mozilla firefox developer and does not work. It doesn't show in any interface to change the browser language.

Não rolou no Firefox

No sirve en Firefox.

Great but it doesn't show in my Firefox

does not work in Mozilla