The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
YouTube Flash Video Player is a powerful tool that will let you choose Flash video player as default YouTube video player.
Customize menus : Helps removing, moving and renaming menus and menu items
Colorize important menu for ease of use! (use Style (CSS))
Change or disable any of used keyboard shortcuts
Support: Firefox, Thunderbird and SeaMonkey
Manage your installed personas (lightweight themes).
Synchronizes selected addressbooks with other instances of thunderbird
using ftp/webdav/imap servers
SmartTemplate4 offers an easy way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every account as well as for the default (all email accounts). Also supports the Stationery Add-on.
Quickly generate mail filters on the fly, by dragging and dropping mails and analyzing their attributes. Create a filter in less than 10 seconds, it's as easy as: drag, click, click.
By popular demand, supports SORTING filters alphabetically.
Automatically do Archive/Copy/Delete/Move actions based on user defined rules
Add "Go Parent Folder" menu to context menu in The Library list view and Search result in Bookmarks Sidebar.