Access Firefox's dictionary...

[aCynic2]

I've clicked the wrong menu item and added some misspellings to the dictionary. How do I delete them?

 

[MadAmos]

I would ask at the mozilla forum

here
more info

 

[firewall]

Open up your Ffx profile [docs and settings > [user id] > Application Data > Mozilla > Firefox > Profile > [random folder name] and then open the persdict.dat file in Wordpad to edit it.