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Using System Colors Increases Memory Usage Substantially

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I'd like some feedback regarding the substantial memory usage I'm seeing in FF4 and a fix that I stumbled upon. I have been trying for sometime to live with the fact that FF was using increasing amounts of memory, especially the longer it stayed open. Today I made a minor personal adjustment, not knowing I was about to stumble upon a possible reason and or fix for this issue. I opened Tools>Options>Content>Colors> and unchecked Use System Colors. I was amazed at the difference! FF is not using nearly as much memory as it previously had. In fact, I ran a test about a week ago comparing the memory usage of FF4 and IE8 using the same two unique web pages opened in two tabs. These are those results using VMMAP from Sysinternals http://dl.dropbox.com/u/10861860/original.jpg Today, after unchecking Use System Colors I ran the same test on just FF4 using the same two unique web pages opened in two separate tabs and here are those results. http://dl.dropbox.com/u/10861860/newVMMAP.jpg

Can someone explain this? I have been using FF for many years but the ever increasing memory usage has almost led me to give up on it and switch to Chrome or IE8, bleh!

Thank you, Stephen in Texas