In order to start using TraceMonkey you will need to enable it, which once again is not straightforward. Here are some simple steps to enable TraceMonkey in Firefox 3.1.
Step 1: Type about:config in the address bar
Step 2: If this is first time you are editing the configuration, agree to the to be careful dialog box.
Step 4: Change the boolean value from false to true by double clicking on it
Step 5: Restart your Firefox.
That’s it, enjoy a much more faster browsing with your Firefox after you have enabled TraceMonkey. Thanks for the tip Tim.