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Firefox Add-ons

Add-ons extend Firefox, letting you personalize your browsing experience. Take a look around and make Firefox your own.

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Live HTTP Headers

by Daniel Savard, Nikolas Coukouma

View HTTP headers of a page and while...

23 reviews

27,510 weekly downloads

Updated May 12, 2008

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Tamper Data

by Adam Judson

Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...

26 reviews

26,402 weekly downloads

Updated July 16, 2008

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Web Developer

by Chris Pederick

Adds a menu and a toolbar with various web developer tools.

89 reviews

128,300 weekly downloads

Updated May 19, 2008

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Total Validator

by Andy Halford

Perform multiple validations and take screen shots in one go. This 5-in-1 validator works with external, internal, or local web pages using the Total Validator service or local copy of the desktop tool...

6 reviews

4,561 weekly downloads

Updated August 25, 2008

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ColorZilla

by Alex Sirota

Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies...

75 reviews

30,251 weekly downloads

Updated June 15, 2008

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Google Advanced Operations Toolbar

by ffhacker

This toolbar provides a shortcut to some of Google's advanced search functions...

297 weekly downloads

URL Shortener

by Geobay Geobay

Make long links and URL's shorter and easier...

58 weekly downloads

Line Marker

by SHIMODA Hiroshi

Adds a new menu "Line Marker" to the context menu.

1,544 weekly downloads

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