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Adds a toolbar button with various web developer tools. The official port of the Web Developer extension for Firefox.
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Notifies you, whenever your browser has been automatically updated.
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SeoQuake extension
SEOquake is a free plugin that provides you with key SEO metrics, along with other useful tools such as SEO Audit and many others
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PDF API HTML5
Mini SDK JavaScript and APIs library to create PDF file for web apps
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Page Load Time
Displays page load time in the toolbar