Privacy and Security

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Adblock Plus Featured

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Rated 5 out of 5 stars (5,661)
669,336 weekly downloads

Password Exporter

This extension allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Rated 4 out of 5 stars (390)
8,626 weekly downloads

Bluhell Firewall

Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.

Rated 4 out of 5 stars (446)
5,183 weekly downloads

Enigmail Requires Restart Featured

OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.

Rated 4 out of 5 stars (194)
4,906 weekly downloads

Mail Merge Requires Restart Featured

Mass Mail and Personal Mail

Rated 5 out of 5 stars (147)
2,000 weekly downloads

Website Blocker Requires Restart

Block websites you don't want the browser to get into.
Block by a whole domain name or a specific address.
Block until further notice or until a certain date.

Rated 2 out of 5 stars (16)
1,813 weekly downloads

Saved Password Editor Requires Restart

Adds the ability to create and edit entries in the password manager.

Rated 5 out of 5 stars (263)
1,712 weekly downloads

AdNauseam

Fight back against advertising surveillance

Rated 4 out of 5 stars (37)
1,445 weekly downloads

FoxyProxy Basic Requires Restart

FoxyProxy Basic is a simple on/off proxy switcher. More advanced features and configuration options are offered by FoxyProxy Standard.

Rated 4 out of 5 stars (32)
1,280 weekly downloads

Master Password+ Requires Restart

Various enhancements for build-in "master password" (MP)
-Locks master security device on demand or after specified time
-Prompts for MP on browser startup
-Suppresses all or duplicate MP prompts
-Locks up entire application or individual windows

Rated 4 out of 5 stars (138)
1,177 weekly downloads

CookieKeeper

Extended Cookie Manager - Keep only wanted cookies.

Rated 4 out of 5 stars (68)
1,010 weekly downloads

StartupMaster

Asks for the master password at startup (fixes multiple password prompt)

Rated 4 out of 5 stars (243)
781 weekly downloads

MEGAbird Requires Restart

Add MEGA support to Thunderbird's Filelink feature.

Rated 5 out of 5 stars (6)
743 weekly downloads

No Resource URI Leak

Deny resource:// access to Web content: We fill the hole to defend against fingerprinting. Very important to Firefox privacy. A direct workaround for bugzil.la/863246

Rated 4 out of 5 stars (24)
704 weekly downloads

Pan

Block ads and manage proxy.

Rated 4 out of 5 stars (81)
474 weekly downloads

Check and Send Requires Restart

Check the message contents and addresses before you send the message...

Rated 4 out of 5 stars (31)
426 weekly downloads

Confirm-Address Requires Restart

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (48)
407 weekly downloads

Silent Block

Minimum and fast URL blocker.

Rated 4 out of 5 stars (28)
367 weekly downloads

StopAll Ads

GO ADS FREE NOW!
Browse Safely. Optimize Surfing

Rated 5 out of 5 stars (7)
326 weekly downloads

Copy Folder Requires Restart

The missing Thunderbird "copy folder" feature! Copy folders or entire POP/IMAP accounts recursively to any location while maintaining folder structure.

Rated 3 out of 5 stars (44)
320 weekly downloads