Remove Firefox Dictionary Entry

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The spell checker is an instrumental feature of word document programs to aid in the coherence of the message. Its addition to web browsers has helped bloggers and forum discussion users do the same with Internet correspondences. As a student of technology and one who spends many hours on the Internet, I have added plenty of acronyms and web lingo to my custom Firefox dictionary. On occasion, I’ll accidentally add an incorrectly spelled word to the list.

As of Firefox version 3.6.10, there isn’t a quick way to remove custom dictionary entries within the Options menu. Removing these mistakes is easy enough. The location of the custom dictionary file varies between Windows operating systems. First, you should close the Firefox web browser.

  • In Windows XP, open up C:\Documents and Settings\{USERNAME}\Application Data\Mozilla\Firefox\Profiles\{RANDOM}.default
  • In Windows 7, open up C:\Users\{USERNAME}\AppData\Roaming\Mozilla\Firefox\Profiles\{RANDOM}.default

{USERNAME} is your computer’s account name. {RANDOM} are some random characters. Some of the folders in this hierarchy are hidden, so you may need to “Show hidden files and folders” within the Folder Options. Inside your profile folder, locate a file named persdict.dat and open it in Notepad or a substitute.

Locate the entry you wish to delete and remove the whole line. Afterward, save the file and you’re done. The misspelling should no longer be recognized as a real word in Firefox.

If you haven’t ever added entries to the custom dictionary or you haven’t closed Firefox to save the entry additions, the persdict.dat file won’t be there because it hasn’t been created yet.

Posted in: Web Browsers



is the site owner of Computer Tech Tips and is passionate about computer technology, particularly Windows-based software, malware removal, and web development. He enjoys helping people troubleshoot computer problems and providing technical support to family, friends, and people around the net. Xps wrote 79 article(s) for Computer Tech Tips.


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