Edit Mispelled Words in Firefox

Firefox keeps a per profile dictionary of custom words. To correct words which inadvertently enter it:

  • Go to “%APPDATA%\Mozilla\Firefox\Profiles”
  • On Mac OS X, go to “~/Library/Application Support/Firefox/Profiles”
  • Enter the profile folder, usually like “.default”
  • Edit “persdict.dat” with a text editor (WordPad, Notepad, or Textedit)

Save, and done.

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