Valencian Language (RACV) Pack for Firefox :: Firefox Add-ons
This extension uses the authentic valencian language spoken in Valencia and regulated by the Royal Academy of Valencian Culture, but it's not the currently official one. If you're looking for a catalan/valencian translation as promoted by the Valencian Academy of Language, please, go to the Firefox official translations page.

Ja ho sabeu, si voleu l'autèntica llengua valenciana regulada per la Reial Acadèmia de la Cultura Valenciana, instaleu-vos això. Si, en canvi, voleu una traducció al català/valencià segons l'Acadèmia de la Llengua Valenciana, llavors no us instaleu això. Espero que hagi quedat ben clar.