Firefox Slow, Fans Speed Up

in macOS edited January 2014
I've noticed recently that sometimes if I have over 10 tabs open in Firefox my fans speed up to 5000RPM. I check Activity Monitor and CPU for Firefox is at 100%. Even if I close all tabs except for one, fans will run high and CPU will remain 100% until I close Firefox. Besides this, opening the Application folder is pretty slow, takes 10 seconds to display. I've done repair disk permissions, but perhaps I should try Techtool Pro as well. Anyone else have any suggestions?




  • Reply 1 of 2
    e1618978e1618978 Posts: 6,075member
    Maybe you are running out of memory, and the system is swapping virtual memory? What kind of laptop do you have? and with how much memory?
  • Reply 2 of 2
    I have a Macbook Pro 2.6ghz Penryn, 4GB ram.

    Just reinstalled Firefox and it seems a lot snappier. Don't know why I didn't think of doing this before. The best part is it retained my profile with bookmarks, passwords, and add-ons. Hopefully won't have the 100% CPU problem anymore.
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