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Do we want to give external websites as guides? Here's the websites I used, I got the firefox one working for v1.5, but can't vouch for the older version.
Spell checker for IE:
http://www.iespell.com/download.php
Spellchecker for Firefox and the Mozilla Suite  = SpellBound 0.7.3
http://spellbound.sourceforge.net/index
http://spellbound.sourceforge.net/install
& Firefox 1.5:
http://www.wildtangents.net/2006/02/04/how-to-get-spellbound-spell-checker-working-with-firefox-1501/

Just not sure about writing it up with external links - whats your thoughts?  

Not a problem.  Those programs aren't available on Wikipedia, so it's okay.  Here's a link for you:

Read more: External links"