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by mr_justin 6193 days ago
Because the JavaScript engine in 3.0 is lightning fast compared to the 2.x engine and the 3.5 is ummm, faster than lightning. By a heck of a lot.

For me personally, the only reason I downgraded back to 3.0 from 3.5 is because Firebug 1.4 is bloody awful at the moment (in beta). Other than that, Firefox 3.5 is great.