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Get before Send Requires Restart
Get messages for the account which is bound to the identity then send the message when you click the toolbar button or the menu item. If your SMTP sever authenticates using POP(IMAP) before SMTP, the extension is useful.
Lock The Text Requires Restart
Encrypt your text data in browser before you submit it to a network
CapsKiller Requires Restart
Caps Killer is a protection against newbies using caps in their mails.
Disable about:config Requires Restart
Disable about:config feature of Firefox and Thunderbird.
DSN Settings 2 Requires Restart
Adds user interface settings for Delivery Status Notification (DSN) requests. This addon is useful for settings for Delivery Notification request and better experience with Notification Viewer addon.
Batch Copy Requires Restart
Batch Copy creates a local copy of your IMAP account, copies all messages and maintains folder structure. Batch Copy can run incrementally to copy only new messages.
Trueblock Plus Requires Restart
Trueblock Plus is a fork of the Adblock Plus extension for blocking unwanted advertisements on the web. This fork provides the exact same features as Adblock plus, with the unpopular, unwanted "acceptable ads" (non-)feature turned off by default.
External Email Alert Requires Restart
Alerts user to confirm that it is ok to send an external email.
Channel Guard Requires Restart
Channelguard disables plugins and protocol handlers to ensure maximum security against side-channel attack.
PennyPost Requires Restart
This extension makes it very easy to generate and attach stamps to outgoing mail. It also automatically detects and verifies stamps on incoming emails. The MBound algorithm requires a 16MB fixed table to work, HashCash is more CPU intense.
Complete master password Requires Restart
The goal is to avoid to have to enter the master password on application startUp.
The extension is not self-sufficient, a script has to extract the master for a secure storage like gnome-keyring, then to transfer it through an environment variable.
Thunderbird Pedophile Reporter Requires Restart
This add-on was created to allow anyone that is contacted by a suspected pedophile or suspected predator. This will gather the header information and send it to our servers to be reviewed by an investigator.
To create your own collections, you must have a Mozilla Add-ons account.