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FF is hardly obsolete. The presentation used vendor-specific extensions (-webkit-) that are not part of the CSS3 spec, much less HTML5. Many of the features could have been implemented in FF had the author used -moz- alongside -webkit-.

That's nice and all, but Firefox is still one of the biggest browsers out there. It's not obsolete, and you can't ignore it if you value users. In fairness, not everyone values users.

Replace "Firefox" with "IE" and your arguments are even more persuasive.

The page crahsed Safari on my iPad.

Firefox support more stuff than Chrome, for example the FileAPI. http://demos.hacks.mozilla.org/openweb/FileAPI/