How to revert Firebug to old version?
<p>I've opened a Firefox today, hit the Firebug button and it showed me that in the new version it is integrated into the developer tools.</p>

<p>I hit ok and realized that it doesn't work at all (everytime using <em>Inspect Element</em> the <code>&lt;body&gt;</code> element is selected). So I would like to revert that setup back, but I cannot find where to switch it. I tried to reinstall Firebug, but that setup is stored somewhere so it automatically starts the DevTools instead of Firebug.</p>

<p>Any help how to revert back to the classic Firebug?</p>