How do you delete a word i spelled wrong and accidentally added to the dictionary on my computer?

I was typing on Firefox and spelled a word wrong, i right clicked to correct it into the right spelling but i accidentally clicked "add to dictionary" instead. so now whenever i type that word wrong, it says its right :/ how do i delete the word from the dictionary? HELP!How do you delete a word i spelled wrong and accidentally added to the dictionary on my computer?
Your personal dictionary, persdict.dat, seems to be in this directory



In Windows XP:



C:\Documents and Settings\your username\Application Data\Mozilla\ Firefox\Profiles\your profile



In Windows Vista (I suspect):



C:\Documents\your username\Appdata\Roaming\Mozilla\ Firefox\Profiles\ your profile



The file seems to be editable with Wordpad.



Hope that helps.