Nice tools, but... While these are all helpful tools, most (but certainly not all) of these are performing functions that are already available from the built-

Nice tools, but... While these are all helpful tools, most (but certainly not all) of these are performing functions that are already available from the built-in developer tools on Chrome. And IETab is rather pointless if it's only available on Windows, because Internet Explorer already has (rather decent) developer tools built in and can render older versions, but it's still not as accurate as running a virtual machine with the actual IE version. The real IE bugs, such as CSS selector limits, are not represented by the renderer. I would be very disappointed to see a professional front-end web developer using all of these extensions while ignoring the built-in options.