Add-ons
Privacy and Security
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DKIM Verifier
Verifies the DKIM-Signature of an e-mail.
29,953 users
Most Popular See all »
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Create and Save or Send Multiple Individual and Personalized Messages from a Draft67,715 users -
Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).48,558 users -
Check the message contents and addresses before you send the message...19,120 users -
Finally, an efficient blocker. Easy on CPU and memory. uBlock Origin (uBO) is a CPU and memory-efficient wide-spectrum content blocker that blocks ads, trackers, coin miners, popups, annoying anti-blockers, etc. in your feeds.14,151 users
Top Rated See all »
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Adds the ability to create and edit entries in the password manager.144 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"3 users -
Create and Save or Send Multiple Individual and Personalized Messages from a Draft67,715 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.441 users -
Removes comment, display name automatically from addresses before sending mail.202 users
Recently Added See all »
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Analyzes To and Cc recipients in the Thunderbird compose window.1 user
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Entra ID SSO for Thunderbird on Linux. A native messaging host bridges to the local microsoft-identity-broker, reusing the device SSO session for Microsoft 365 / Exchange (Conditional Access outside Edge). Companion host required.2 users -
Email inbox cleanup: sender statistics, bulk deletion, newsletter unsubscribing, and automatic cleanup rules.16 users -
Gmail-style Undo Send for Thunderbird — delay outgoing mail 5–60 seconds and cancel before it goes out .
configurable delay, undo from notification/queue, dark mode, no network, no telemetry50 users -
Displays SPF/DKIM/DMARC authentication results as a banner when viewing emails. Shows DKIM alignment and domain registration date to help understand what authentication results actually mean.3 users -
Store your attachement in your own Minio server, replacing them by a temporary URL.
MinioFilelink works with private Minio server, enabling to secured who can access the attachment at network level (outside of the plugin).2 users
See all 248 extensions in Privacy and Security »
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