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This post will show you how to remove those 2 dashed lines (hyphens) that appear above the email signature in Thunderbird. The technical name for these dashed lines is the “signature deliminator.” To switch it off for all email accounts, follow this tutorial; you can find it in the video above or in the text below.

  1. Start by opening Thunderbird. Click the Menu icon (the icon of 3 dashed lines stacked on top of each other) > Options > Options > Advanced > General tab.
  2. Next click on the ‘Config editor’ button towards the bottom right side of the screen Advanced Options window. (A window will pop up warning you to be careful, explaining to you changes made could void your warranty. Click “I’ll be careful, I promise”.)
  3. In the “Config Editor”, find the search box near the top of the window. In the search box type: “separator”. Look for this line: mail.identity.default.suppress_signature_separator; false
    Double click to toggle ‘false’ to ‘true’ or right click on line and select ‘Toggle’.
  4. Next, close the Config Editor – Click the top right “X” (closing the window)
  5. In the “Advanced Options” window, click on OK to save changes.

You are done! Open a new message to see if your changes saved properly.