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Why does Firefox 4 hog 50% or more of system resources?

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Firefox 4 is slow and has serious memory leak issues. I have seen this question elsewhere but often in reference to plugincontainer.exe for Windows or earlier versions (3.5 and onwards).

On a Mac, running OS X.6.6 and FF4, system resources for Firefox reach 50% or more when running a single-tab *without* Flash content. Numerous extensions are loaded.

Running FF 3.6 (last release) with the same extensions and plugins, system resources are 10% or less.

Safari 5.0.3 with similar extensions runs at 6% system resources or less.

FF4 is currently all-but unusable in most situations. Streaming video / Flash content overheats the CPU (my fan kicks in). System is 2.4 GHz Intel Core 2 Duo.

To top it off FF4 often fails to close upon quit and requires a force quit.