Reporting the problem will help identify sites with problems so Mozilla evangelists can help fix their problems, and also help Mozilla developers track down any bugs in Firefox that could be causing excessive CPU usage. Report the site using Help -> Submit Feedback. You can disable JavaScript selectively using the NoScript extension. Some sites can cause high CPU usage through extensive use of JavaScript. If the problem happens when viewing PDF files in the browser using the Adobe Reader plugin, disable the Adobe Reader plugin (see Issues related to plugins for details) and either use Adobe Reader as an external application, use another PDF viewer or else use the built-in Firefox PDF viewer.
If you're only having problems with sites that use Flash and updating to the latest Flash version doesn't help, you can use the Flashblock extension to selectively enable or disable it
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