Hi  !

As those language packs are no longer compatible with the latest version of Firefox (the developers haven't updated their extensions), maybe it would be best to download the latest Firefox version in the language of your choice from here :

https://www.mozilla.org/en-US/firefox/all/

Thanks Happy112.

I had considered that, but I don't want to lose all of my bookmarks, passwords and add-ons etc. Will saving my profile solve this, even if my current version of Firefox is in Italian and not in English?

Good question  !

You might indeed want to back up your Firefox settings, just in case.

See :

Back up and restore information in Firefox profile

Merely uninstalling Firefox and reinstalling it again shouldn't cause an issue with your Profile, as the un-installation routine purposely doesn't touch your Profile where all user data and add-ons are stored. But as Happy said, backup your Profile folder just-in-case.

You can find language packs for 64-bit Firefox 58.0 here:

• https://download-installer.cdn.mozilla.net/pub/firefox/releases/58.0/win64/xpi/

Thank you everyone.

I ended up installing the English language version of Firefox, but have now also downloaded the language packs seeing as they are finally available.