This UK English add on does NOT work in Firefox Quantum 58.0.2

I do not want or need US English in the UK.

Just one more reason for making Chrome my default browser at the moment.

Speaking personally I don't seem to have experienced any of the much publicised speed gains from Quantum on my up-to-date i7 Lenovo ideapad.

The site defaults to US English which is not correct UK English is the correct language and should be the default language not American. I respect that America has their own version of English but actually it is American and not English and should be respected as such. Totally agree if Mozilla wants English money to support then should make proper English the if not priority site an alternative.

Don't work

This is not working. I have to keep adding words to my dictionary, because it is looking to use US English. I detest being forced to misspell.

Simply DOES NOT WORK - Leaving Firefox unable to work in English; as opposed to the "dumbed down" American dialect! NOT GOOD ENOUGH!

Not working. Get a grip Mozilla!

Doesn't do anything. The user interface is still in French !!!! I'll have to get back to Chrome - sorry

НЕ работает , не могу установить его

Doesn't actually do anything

Well, it does nothing whatsoever.

Not available for Firefox 57.