How to enable spell-checking in Firefox 2.0 or later

I recently noticed that an install of Firefox on a new machine didn't, for some reason, have the spell-checker enabled, which probably led to one or two typos on this blog (sorry!). So, for those of you who haven't worked out how to fix this, or never knew it existed - this simple fix should have you literate in no time.

1. Right click an editable text box (The body of an email you're writing should be good).
2. Choose 'Add dictionaries'
3. Pick your language (they even have Welsh!)

Oh and, don't forget your Firefox addons

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If you're using Internet Explorer - check out iespell.