Comment 12 for bug 157921

I had the same problem.

This is how I fixed it:

I deleted the /usr/lib/firefox-3.0.12/dictionaries symlink and created a directory with the same name. I then symlinked only the following files from /usr/share/myspell/dicts to /usr/lib/firefox-3.0.12/dictionaries:
- en-GB.aff
- en-GB.dic
- hyph_en_GB.dic
- hyph_sl_SI.dic
- sl-SI.aff
- sl-SI.dic

The language list in firefox is now almost as I want it to be:
English / United States
English / United Kingdom
Slovenian / Slovenia

All I need to do now, is to get rid of "English / United States", but I don't know how to do that. Any ideas?