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The ESA/ESO/NASA FITS Liberator
An advanced program that allows you to handle FITS and PDS files...
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...
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
QLFits
See FITS headers in the Finder!...
view display quicklook plugin display fits header view fits header