The latest version of Enigmail works with the following applications:

  • Thunderbird 38 and newer
  • SeaMonkey 2.35 and newer

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To install Enigmail on Thunderbird, use right click "Save Link as ..." to save the extension locally. Then navigate to the Thunderbird menu Tools > Addons and click on the small Tools button in the upper right corner and then on Install Add-on From File....