Sadly this version doesn't contain updated languages 
https://github.com/AdguardTeam/AdguardForWindows/issues/975
@ Boo Berry
Try this:
Adguard extension is producing such rule when clicking on "Disable filtering on this site".
https://github.com/AdguardTeam/AdguardForWindows/issues/975
@ Boo Berry
Try this:
Code:
@@//accounts.firefox.com^$document