To install your email signature in Thunderbird for Windows, follow these steps:

  1. Click on the 'Download Signature' button from the Install Signature popup to download your signature file.
  2. In Thunderbird menu, go to Options > Account Settings.
  3. From the left menu select your email account.
  4. In the 'Settings', select the checkbox that says 'Attach the signature from a file instead (text, HTML, or image):' and then click the 'Choose…' button.
  5. Locate the email signature file (.htm) you downloaded in Step 1 and hit 'OK' to save the changes.

That’s it, compose a new email to test your signature.

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