Spell checking dictionaries at https://addons.mozilla.org/en-US/firefox/language-tools/ are developed by third parties, submitted to Mozilla for examination/testing and put on the list. Not all languages are available on that list.

Other dictionary sources can be found here: http://kb.mozillazine.org/Dictionaries
There is a Swedish dictionary on the mozdev link under "Sources".

Also see:

• http://support.mozilla.com/en-US/kb/Using+the+spell+checker
• http://kb.mozillazine.org/Spell_checking

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This may be a more recent Swedish dictionary

• http://extensions.services.openoffice.org/project/dict-sv

See [/questions/922082]

You need to extract the two dictionary files (sv_SE.aff and sv_SE.dic) in the dictionaries folder in the ooo_swedish_dict_1.44.oxt ZIP archive and copy them to the dictionaries folder in the Firefox program folder (C:\Program Files\Mozilla Firefox\)

• http://kb.mozillazine.org/Dictionaries#Installing_manually_to_the_application