Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
27,756 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft74,926 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).52,958 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/24,210 users -
Check the message contents and addresses before you send the message...19,671 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.161 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 Draft74,926 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.757 users -
Removes comment, display name automatically from addresses before sending mail.220 users
Recently Added See all »
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Advanced email forensics. Maps hops, detects VPNs, and provides deep security analysis.0 users -
AI-powered email phishing detection using a private, local LLM. No data leaves your device.
Supported Local LLM Providers:
- Ollama
- LM Studio
- llama.cpp server
- vLLM
- etc.3 users -
Automatically set From address to match email aliases when replying, with optional alias suggestion and identity creation1 user -
Reveals real destinations of obfuscated email security links and shortened URLs with privacy-preserving resolution.6 users -
Spam Master brings real-time spam and threat protection to Thunderbird by connecting with the Spam Master SaaS platform. Automatically filters unwanted emails and keeps your inbox clean.16 users
See all 206 extensions in Privacy and Security »
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