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Header Spy
A Firefox add-on that shows HTTP header in statusbar....
BBCode Header
Custom control for REALbasic that deals with text customization....
control custom RealBasic REALBasic control improve functionality
Header Spotlight
A free and Spotlight themed message style for Adium...
adium xtra xtra adium message style message style adium customization
Header Design Inc
A Thunderbird add-on that provides you a concise message reader...
message highlight preview Thunderbird extension highlight Link
Header Monitor
Header Monitor - Mozilla statusbar with HTTP response header monitor....
Header Skip
Firefox add-on that allows you to scroll down a page when the page is a realgm message forum page....
Site Header Editor
A Firefox extension that lets you modify the headers that are usually sent to web servers...
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header scroll extension for ThunderBird
A Thunderbird add-on that adds a scrollbar to the extended all header view...
ThunderBird Header Tools Extension
ThunderBird add-on that allows you to modify the header detail of messages....
ThunderBird Reset Quote Header
ThunderBird Reset Quote Header - ThunderBird add-on that modifies the quote headers on replies....
Display mailing list header for ThunderBird
A Thunderbird add-on that implements RFC 2369...
mail header Thunderbird extension Thunderbird mail list header
Toggle Compose Headers for Thunderbird
A ThunderBird add-on that allows you to hide or, on the contrary, to "unhide" headers in compose window...
Headers Toggle for ThunderBird
A ThunderBird add-on that adds a keyboard shortcut to toggle between different header display...
toggle header Thunderbird extension Thunderbird header toggle
Recipients Overview for ThunderBird
Recipients Overview for ThunderBird - ThunderBird add-on that displays all mail recipients....
MessageFaces for ThunderBird
MessageFaces for ThunderBird - ThunderBird add-on that displays face images in the message header section of e-mails....
The unPoster
The unPoster - Have you ever tried to see what files are available in a newsgroup with several million posts...
ExifInfo X
ExifInfo X - Extract EXIF headers from photos...