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Web Developer
Menu and a toolbar with various web developer tools.
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SeoQuake plugin
Show indexed pages, pr, backlinks, dmoz, alexa rank, if domain is present in archive.org, internal link, external link, keyword density and much others thing of visited website
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iWeebTool plugin
Access webmaster services and web tools from iWEBTOOL directly from the web browser
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Firebug Plugin
You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.
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ColorZilla
This plugin is very useful when you want to set in the right mode the colors of your adsense
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MeasureIt
Draw out a ruler to get the pixel width and height of any elements on a webpage.