How to Add a Dictionary to Mozilla Thunderbird Spell Check

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Your Mozilla Thunderbird's spell check may only be limited to finding fault with your English, regardless of whether you compose your emails in Arabic, English, French or even Icelandic. Given how useful spell checking can be especially with languages other than your native, Mozilla Thunderbird should really be able to learn new tongues -- and fortunately, it can. All it needs is the proper dictionary.

Add a Dictionary to the Mozilla Thunderbird Spell Check

To install a new language for the Mozilla Thunderbird spell checker:

  • Select Tools | Options… or Thunderbird | Preferences… (Mac) from the menu in Mozilla Thunderbird.
  • Open the Composition category.
  • Go to the Spelling tab.
  • Click Download More Dictionaries.
  • Follow the Download Dictionary link for the desired dictionary.
  • Click Add to Thunderbird.
    • Wait for the download to finish; even if nothing seems to be happening, chances are a dialog will eventually appear.
  • Click Install Now under Install add-ons only from authors whom you trust.
  • Now click Restart Now.

Add a Dictionary to the Mozilla Thunderbird Spell Check in Mozilla Thunderbird 2/3

To install a new spell checking dictionary in Mozilla Thunderbird 2 and 3:

  • Open Mozilla Thunderbird.
  • Select Tools | Add-ons from the menu.
  • Open your browser.
  • Go to the Mozilla Thunderbird dictionaries page.
  • Follow the Download Dictionary link for the desired language.
  • Drag and drop the desired Download Now link to Mozilla Thunderbird's Add-ons window.
  • Switch to the Add-ons window.
  • Click Install Now in the Software Installation dialog.
  • Now click Restart Thunderbird.

You can use the new dictionary by selecting it from the Spell drop-down menu (click the down arrow) while composing a message.