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A prompt will appear asking for permission to install the software. Click "Install Now."
I notice you're asking about for Firefox 12 — that's a very old version (Firefox 12 was released in April 2012). Firebug has since been discontinued and is no longer maintained. firebug download for firefox 12
For many web developers, the "Firebug" icon was the first door into the hidden world of DOM trees, CSS cascades, and JavaScript consoles. While the web has largely moved on to built-in tools, some legacy workflows or older systems still rely on specific vintage setups like . A prompt will appear asking for permission to
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