That is OK, if you are talking about older browsers or browsers on limited / obscure platforms. Firefox doesn't fit the bill, and optimizing the site just for ~

That is OK, if you are talking about older browsers or browsers on limited / obscure platforms. Firefox doesn't fit the bill, and optimizing the site just for ~~IE~~ Chrome hurts the FF users and makes Chrome win even more - leading to self-fulfilling claim that Chrome is faster. It's not, but it will be if people optimize for it. This is one of the reasons I make a point to always develop in Firefox and later just check in Chrome (note that I still do check, because majority of people use it) - apart from simply better experience of course. :)