== Playing with TraceMonkey ==
TraceMonkey is currently available and ''enabled by default'' for testing in [ftp://ftp.mozilla.org/pub/firefox/nightly/latest-trunk/ nightly builds]. You will need If you want to go take modify the following steps to turn it ontypes of JavaScript that are executed using TraceMonkey:
* open a new tab
* type '''about:config''' and hit enter
* read the warning and heed its wisdom
* enter '''jit''' in the filter field
* double click on change the value of '''javascript.options.jit.chromecontent''' to enable (true) and disable (false) TraceMonkey for JavaScript in web content* change the value of '''javascript.options.jit.contentchrome''' to change their values to '''enable (true''') and disable (false) TraceMonkey for JavaScript in XUL/chrome
If you experience instability, please [http://bugzilla.mozilla.org file a bug] and reference any crash report ID that might be relevant.