Removing accidently added words from Firefox’s spell check
If your like me, quick on the draw with the context menu, then you probably have added your fair share of misspelled words to Firefox’s spell check.
To fix this, simple remove the offending entries from a file called persdict.dat in your profile directory.
On windows this file is located here: C:\Documents and Settings\*user*\Application Data\Mozilla\Firefox\Profiles\*profile*\
I am not sure where it is located on linux, so just run locate persdict.dat