Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
29,834 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft81,034 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).56,247 users -
Confirm mail address and attachments based on flexible rules.
This is enterprise edition with less updates. Another edition for regular users:
https://addons.thunderbird.net/thunderbird/addon/flex-confirm-mail/27,215 users -
Check the message contents and addresses before you send the message...21,884 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.158 users -
Adds optional columns to the Thread Pane to allow sorting email messages by:
* Full sender address -- e.g. "someone@example.com"
* Sender's domain -- e.g. "example.com"
* Sender's local part -- e.g. "someone"
* Sender's TLD -- e.g. ".com"5 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft81,034 users
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Users of outlook.com and o365 who have Advanced Thread Protection enabled will have all URL's in emails changed to redirect them to an Microsoft filter before opening. This is a bad idea.
This plugin will change the URL back to the original value.570 users -
Removes comment, display name automatically from addresses before sending mail.234 users
Recently Added See all »
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mleak is a Thunderbird extension for per-mail osint header and body analysis. MUA fingerprints, server stack, M365 tenant data,relay path, auth verdicts and integrity signals.
100 % offline. No network access, no telemetry, no external dependencies.1 user -
Send files directly from Thunderbird using PARAMANT — post-quantum encrypted, burn-on-read. Files are destroyed after first download. Requires a free PARAMANT API key.1 user
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Open Security Deadlines (https://sec-deadlines.github.io/) in a Thunderbird Tab. No affiliation with the original website.1 user
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Analyze DMARC aggregate and forensic reports locally within Thunderbird. Visualize authentication results per domain, classify source IPs, detect threats, track DKIM/SPF/envelope alignment, and export data. Fully offline with zero network requests.35 users -
Basic extension to support add-on installation from addons.thunderbird.net, without requiring the privileged mozAddonManager API.214 users
See all 224 extensions in Privacy and Security »
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