Firefox uses up 10% of processor even when idle. Why?

Firefox 3.6 uses at 10% of processor power even when idle, parked on Google. I have McAfee, which uses 5% to 10% on top.
Firefox loses keystrokes. It gobbles up a lot of memory very fast (did not do this before). After about 2-3 hours of surfing, it uses up 6-% to 70% of processor power to the point I have to reboot.

Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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