Privacy and Security

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Certificate Patrol

Your browser trusts many certification authorities and intermediate sub-authorities quietly, every time you enter an HTTPS web site. This add-on reveals when certificates are updated, so you can ensure it was a legitimate change.

Rated 4 out of 5 stars (74)
14,902 users

Change Referer Button

Button in the toolbar/status bar to change referer value.

Rated 4 out of 5 stars (21)
2,516 users

Channel Guard

Channelguard disables plugins and protocol handlers to ensure maximum security against side-channel attack.

Rated 4 out of 5 stars (2)
48 users

Check and Send

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

Rated 4 out of 5 stars (24)
23,759 users

Check Domain

This extension is to display the warning dialog when you send mail for multiple domains.

Rated 4 out of 5 stars (4)
1,933 users

clamdrib LIN

"clamdrib LIN" ist wie der Name schon sagt die Weiterentwicklung des Add-on clamdrib, allerdings nur noch für Linux. Sämtliche E-Mails, Feeds und News werden auf Viren und anderes Ungeziefer geprüft und gemeldet. Gelöscht wird hierbei jedoch nichts!

Not yet rated
142 users

Clear IMAP Local Cache

Clears IMAP local cache on startup.

Rated 5 out of 5 stars (1)
295 users

Close Proxy Authentication

Provides transparent proxy authentication on your enterprise network.
Close authentication dialog if login on proxy failed.

Rated 5 out of 5 stars (2)
611 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (26)
43,910 users

confirm-mail

メール送信前に宛先メールアドレスと添付ファイル名を確認することができるアドオンです。

Rated 3 out of 5 stars (5)
2,778 users

CookieFast

A small ergonomic 1-click cookie manager.

Rated 4 out of 5 stars (9)
396 users

CookieKeeper No Restart

Extended Cookie Manager - Keep only wanted cookies.

Rated 4 out of 5 stars (38)
12,760 users

CookieSafe - Control cookie permissions

Control cookie permissions.

Rated 4 out of 5 stars (22)
2,175 users

Copy Folder

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 (30)
9,170 users

Correct Identity

Ever sent mail from the wrong email address because you forgot to select the correct identity in the compose window?

Rated 4 out of 5 stars (81)
6,635 users

CRL over LDAP

Allows importing CRL from LDAP directories.

Not yet rated
7 users

CryptoData

Easily and quickly to encrypt / decrypt
For users: private messages via e-mail, blogs, social networks, forums, etc.
For webmasters: websites, images, photos, etc.
Support: Firefox, Thunderbird and SeaMonkey

Rated 5 out of 5 stars (4)
1,061 users

Customizations for Adblock Plus No Restart

This extension provides various customization options for the Adblock Plus user interface.

Rated 5 out of 5 stars (12)
20,780 users

Disable about:config

Disable about:config feature of Firefox and Thunderbird.

Rated 1 out of 5 stars (1)
250 users

Disable Addons

Disable Addons.

Rated 2 out of 5 stars (1)
5 users