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Colorzilla
https://addons.mozilla.org/en-US/firefox/addon/271
[With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom the page you are viewing and measure distances between any two points on the page.]

Firebug
https://addons.mozilla.org/en-US/firefox/addon/1843
[Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.]

Html Validator
https://addons.mozilla.org/en-US/firefox/addon/249
[HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon in the status bar when browsing.]

IE Tab
https://addons.mozilla.org/en-US/firefox/addon/1419
[This is a great tool for web developers, since you can easily see how your webpage displayed in IE with just one click and then switch back to Firefox.]

MeasureIt
https://addons.mozilla.org/en-US/firefox/addon/539
[Draw out a ruler to get the pixel width and height of any elements on a webpage.]

Mozilla Accessibility Extension
https://addons.mozilla.org/en-US/firefox/addon/1891
[The Mozilla/Firefox Accessibility Extension makes it easier for people with a disability to view and navigate web content. Developers can use the toolbar to check their structural markup to make sure it matches the page content.]

Open Image In New Tab
https://addons.mozilla.org/en-US/firefox/addon/2248
[Adds right-click context menu item for opening images in new tabs.]

OperaView
https://addons.mozilla.org/en-US/firefox/addon/1190
[Open pages in Opera from Firefox and Mozilla context menus. Very usefull for web developers but not only!]

Screengrab!
https://addons.mozilla.org/en-US/firefox/addon/1146
[It will save what you can see in the window, the entire page, just a selection, a particular frame... basically it saves webpages as images.]

Web Developer
https://addons.mozilla.org/en-US/firefox/addon/60
[Adds a menu and a toolbar with various web developer tools.]

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