Paul, firefox uses the spelling dictionaries installed system-wide in /usr/share/hunspell, independently of the language pack extensions.
As far as en-US is concerned, this is the default locale that firefox is built in, so the corresponding dictionary is embedded in firefox. There is no way to make a locale-agnostic build. If you really wanted to get rid of the embedded dictionary, you would need to unpack /usr/lib/firefox/omni.ja (zip format), delete the contents of the 'dictionaries' directory, and repack it. ** Changed in: firefox (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1865128 Title: English US spelling dictionary appears in the languages' menu even though it's not installed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1865128/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs