We allow and encourage an upgrade but you cannot reverse this process. Once your users have the WebExtension installed, they will not be able to install a legacy add-on.
Dowólujomy a pśiraźujomy aktualizaciju, ale njamóžośo toś ten proces pśewobrośiś. Gaž waše wužywarje su WebExtension zainstalěrowali, njamógu wěcej dodank starego typa instalěrowaś.