Corrupted message body display

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The body of your messages shows as strange characters that replaces your normal ASCII characters.


  1. Exit Thunderbird.
  2. Back up your prefs.js file.
  3. Open prefs.js in a text editor (e.g., Notepad) and look for this line:
user_pref("", "CSD10");
  1. Note that "CSD10" may not be the name of the font in your prefs.js file.
  2. Remove this line and save prefs.js as text.
  3. Start Thunderbird and test it.