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Thunderbird: edit user dictionary

  • Oct 25, 2025
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In Thunderbird terms that were entered manually into the dictionary, it is subsequently in a separate directory. This is e.g. necessary if you want to correct a misspelled word or simply delete.

To edit the user dictionary in Firefox

Basically, you add a term to the dictionary by writing a new E-Mail. This is where you write a word and then you save it on "spelling" > "add a word" (see image). But what if you have taken accidentally misspelled terms? Then you have to resort to a Trick with the spelling error in the personal dictionary can correct:
  • First, you need to re-open the window for a new E-Mail. To do this, click on Compose icon bar at the top left of the main menu.
  • Here you click on the top left next to the Send Button on "spelling". The box is grayed out, click with your mouse in the Compose box. Then the Button is visible and you can click on it.
  • Then, select in the field "user dictionary" in the "edit" button (see image).
  • There you will find a listing of all the terms that have been added to the user dictionary. Unwanted entries can be deleted by highlighting the entry and clicking Remove. The dictionary entry is "Replace" but also immediately correct it.
Dictionary edit
Practice tip applies to Thunderbird Version 17.0.6. Tip: How to use the spell checker in Thunderbird to install, read here.

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1 COMMENTS

El Narizon, Sun 12, 2022

Not a good idea. The built-in editor makes the whole process hang as the dictionary grew. And it does grow over the time. Even waiting for 10 minutes and the process still hangs, prone to task-kill. The config does not make it possible to define a 3rd party editor software to be used when clicking on "Edit".

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