Install the "Flashblock" plugin because we all know most unwanted high CPU usage situations come from the browser usually because of a looping Flash ad taking up 100% CPU.
The solution is to install the "Flashblock" plugin that doesn't allow any Flash to load and play unless you click on the placeholder.
slowing, firefox, browser, install, flashblock, plugininstall, quot, plugin, unwanted, cpu, usage, looping, doesn, placeholder,