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Text overlaps on Mac

From MozillaZine Knowledge Base

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This article deals with text overlapping on Mac OS X, where text in web pages, text boxes or e-mail messages becomes jumbled. The problem may be caused by duplicate fonts. To fix it:

  1. In the Applications Folder, open Font Book
  2. In the "Collection" column, select "Computer"
  3. All duplicates will have a bullet after them. Use the command key to select all of the fonts with duplicates
  4. Choose Edit -> Resolve duplicates
  5. Restart Firefox/Thunderbird/whatever