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I think it is ok to include ff4 considering it will be released tomorrow.

"I'm somewhat disappointed when charts like this use pre-release browser versions like Firefox 4 beta."

Well, at least browsers release. Unlike HTML only-sorta-5-for-legacy-reasons [1], which gets to just float along making changes whenever. Using pre-release browsers to test a pre-release specification is basically how the system is designed, now.

[1]: http://lists.whatwg.org/pipermail/whatwg-whatwg.org/2009-Dec...

Firefox 4 beta 1 was released in July, and the Chrome 6 beta was released in August. One could easily argue that the Firefox late betas are better tested than Chrome releases. (I'm not, but you could). So it's apples and oranges no matter what you do, there's no possible way of comparing apples to apples.

I'm just wondering why they aren't including Firefox 4 and IE 9 final. Both versions are available (though Firefox 'officially' launches tomorrow).