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United States English Spellchecker 8.1 No Restart
United States English Spellchecker for Firefox, Thunderbird and SeaMonkey by Kevin Atkinson and Geoff Kuenning.
To enable, right-click in a multi-line text box, select "Languages", then "English (United States)".
About this Add-on
The affix file is a heavily modified version of the original english.aff file which was released as part of Geoff Kuenning's Ispell and as such is covered by his BSD license.
I would remember to everybody that this extension provides only a United States English spellchecker, so if you're instead looking for a British English spellchecker, you can get it from https://addons.mozilla.org/en-US/firefox/addon/british-english-dictionary/
Please, _DO NOT_ ask for support here. If you need support, post your question to http://forums.mozillazine.org or to http://forum.mozillaitalia.org
Data comes from here: https://sourceforge.net/projects/wordlist/files/speller/2016.01.19/