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"It does work with Firefox 6 - it's now found in Tools->Web Developer."

How can i have this icon in "tools" without this "Web DEveloper"-Submenu?

Questa recensione riguarda una versione precedente (2.0.7.1-signed) del componente aggiuntivo. 

Yes, it's moved in Web Developer along with other tools like Firebug. You can alternatively put it in your toolbar: http://support.mozilla.org/en-US/kb/customize-firefox-controls-buttons-and-toolbars