Extension which embedding Internet explorer in tabs of Firefox. Great tool for web developers to see how their pages displayed in IE with just one click.
This extension appears on the status bar of the browser, which provides you google PageRank, Alexa Popularity ranking, keyword density, backlinks in Google, Yahoo and MSN and many other tools.
This extension adds HTML validation inside Firefox. The number of errors of a HTML page is seen on the form of an icon in the status bar and the details of the errors are seen when looking the HTML source of the page.