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Posting Style Enforcer
Requires Restart
Automatically converts top-posted messages to use bottom-positng or vice versa. Interleaved posts are left alone. Detects automatically added text and supports a per-contact list of exceptions.
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.
FastCC
Requires Restart
A Thunderbird extension that let you switch to cc: with the ALT+CTRL+C keyboard shortcut!
Synnefo for Filelink
Requires Restart
Add Synnefo support to Thunderbird's Filelink feature.
~okeanos for Filelink
Requires Restart
Add ~okeanos support to Thunderbird's Filelink feature.
Patch to Alert Invalid Addresses
Requires Restart
Shows alert if there is any invalid address in sending message.
HtmlHighlightr
Requires Restart
Provides source code highlighting in editor's "Insert HTML" dialog.
Custom Sender Address and Reply
Requires Restart
Select sender mail address based on the recipient and reply with the same address
TarotSignature
Requires Restart
This version provides a custom button for the message composer.
You need to customize your toolbar of the message composer.
The signature is hard-coded into the source code.
The signature is NOT being inserted automatically on window-open.
AutoCopy_rebirth
Requires Restart
Lightweight add-on that automatically copies any highlighted text to clipboard.
To create your own collections, you must have a Mozilla Add-ons account.