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There has been several blogs that lists the best Firefox extensions that are out there. Since Pingdom are operating in the web performance and monitoring field we decided to make our own list of valuable Firefox extensions. In this list we don’t cover the well known extensions such as Web Developer Toolbar and Firebug but rather focused on “lesser known” ones that can help development and testing. Extensions that deal with HTML, CSS, SEO and design were also ignored since other blogs have already made good lists of these kinds of tools. Let’s get on to the list.