How does GMail know I use Firebug extension in Iceweasel?

Recently gmail has begun displaying the following notice when I login to its web interface:

"Firebug is known to make Gmail slow unless it is configured correctly."

It offers a couple of option to disable/configure it. However what I find disturbing is how gmail 'knows' what extensions I have installed on my machine. Is there a bug in iceweasel/firefox that leaks out some information on extensions to the remote servers?

A search on google tells me that many others have noticed this too, but I could not find how google does it.

Thanks,
Raj Kiran


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