I use the shit out of this Resolution Test that resizes your window, keeps me honest: Link
This full page screen capture works as advertised and isn't bloaty: Link
Nice and simple page load time: Link
And of course shameless plug for a little extension I made that shows you a random Google font when you open a new tab: TypeTab
Clearly is one I use a lot. It pulls out the text and images from an article and makes it readable.