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Header Spy
A Firefox add-on that shows HTTP header in statusbar....
Header Design Inc
A Thunderbird add-on that provides you a concise message reader...
message highlight preview Thunderbird extension highlight Link
Header Spotlight
A free and Spotlight themed message style for Adium...
adium xtra xtra adium message style message style adium customization
BBCode Header
Custom control for REALbasic that deals with text customization....
control custom RealBasic REALBasic control improve functionality
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
Convert
Complete upgrade/rewrite of the highly acclaimed Convert!...
calculate measure conversion measurement unit calculate conversion
Convert Encoding
Open source Automator action to convert files between text encodings...
convert automate Automator action text encoding Text Encoding Converter
TXF Convert
Changes your TXF financial data into a file viewable by a spreadsheet or word processor...
Convert for iPod
Automator action that creates movie files for viewing on an iPhone, iPod, or Apple TV...