Why is Firefox using 50%+ of cpu activity and the longest time

Checking Task Manager after frequent slowdowns and almost cont. disk activity ,I found in a 100h system idle time the highest user is firefox at 4h and 1.2million I/O writes. This happens after periods of not using the machine (left on) . At times it hogs all the resources even after just waking up the display with screen rewrites taking seconds and with no requested net activity. This can also happen in the background.

Best to post in the macbook pro forum
Direct you to the proper forum for MacBook :
MacBook Series Forumshttps://discussions.apple.com/community/notebooks?view=discussions
Mac OS X Forums
https://discussions.apple.com/community/mac_os?view=discussions
http://www.apple.com/support/macbookpro
We are not notebook users.
What does Activity Monitor show for process that are the most active running?
There is an Apple article or user tip on what can cause battery drain, like those on the RIGHT "More like this"

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