Which Versions of FireFox Should I Support? [closed]

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I have recently built a template for a website that I see looks slightly different in different versions of FireFox. I was wondering, as a rule of thumb, which versions of FireFox are worth supporting? FF2 and up? FF3 and up?

Thanks for your help,

spryno724

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Depends on your audience, really. Have you looked at your logs/analytics data to see what the majority of users are hitting your pages with? You will need that piece of data to answer your own question well.

Having said that: with FF4 out now, I think it is safe to support 3.6 and above only.

The Mozilla community tends to take the upgrade path quicker than most.

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It depends on your audience, but generally people keep non-IE browsers up to date.

So most people will be on at least Firefox 3.5. Very few will be using 2.

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Here are Firefox version usage stats:

http://www.w3schools.com/browsers/browsers_firefox.asp

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Personally, I would only support 3 and up. I have very little tolerance for those still on old systems and would only provide full browser support for things like a banking website that EVERYONE needs access to. Otherwise, I would try to wean users off older browsers.