Thunderbird HTML email signature installation guide

Step 1 — Create your signature

Create your email signature in

Step 2 — Open Thunderbird signature settings

Open Mozilla Thunderbird

Click on your email account name e.g. and then on View settings for this account option under the Accounts section.

Check the box for Signature text: ☑️ Use HTML (e.g., <b>bold</b>)

Step 3 — Paste signature

Return to in your browser and click the yellow copy HTML button

Return to Thunderbird settings and paste into the box below Signature text and click OK

Select Write a new message

Your Mirosign email signature will appear in the new email window like this:

Any further questions?

If you’re still having issues using Mirosign or we haven’t answered your question here, please get in touch and we can help you in person.

Contact us