OK so I've accidently added a word into my dictionary and I want to remove it.
Firefox doesn't seem to provide a place to remove it easily, so we're gonna have to poke around a bit in the profile folder.
- Close all instances of Firefox.
- Find your profile folder using these instructions.
- Now open up Notepad.
- Drag "persdict.dat" into Notepad and remove the word you accidently added.
- Save and close.
