I used to have English (US) Language Pack before the latest Firefox update.
I have added this again but it’s not there when I right click to change to English from Swedish.

English (US) Language Pack

To change the spelling language you want to install the spell checker and not the language pack.

Thanks!!! That makes sense and it worked.
What threw me off was the link… see marked in Yellow. It doesn’t make sense to me that it goes to the language pack as I set language in order to spellcheck. See scree

nshot! :blush:

However as you can see on the screenshot I got the spellcheck there as well and I nog have English in the list (Engelska in Swedish :blush:)