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Note: This will not work if you don't have Firefox and JavaScript enabled. This works by asking the browser to render the chrome that has been registered by each browser extention. Once they load up properly it uses an onload event handler to write to a span tag. Using this you can detect what is installed on a extention by extention basis.

You are not using Search Status
You are not using ViewSourceWith
You are not using AutoCopy
You are not using Google Toolbar
You are not using FlashBlock
You are not using IEView
You are not using IETab
You are not using Server Switcher
You are not using FasterFox
You are not using Web Developer
You are not using JSView
You are not using Customize Google
You are not using SEOpen