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javascriptfirefoxdetectfirefox-3tracemonkey

How to detect TraceMonkey?

Is it possible to detect that a Firefox browser is running the TraceMonkey JavaScript interpreter? If so, is it possible to do it with JavaScript? A solution which involves examining the browser binary or shared libraries is also OK for me. I'm running Linux with Firefox 3.0.14 right now.

Solution
    1. enter "about:config" as URL
    2. say you will be careful
    3. search "JIT"

    you can check if it's enabled by looking at:

    javascript.options.jit.chrome -> for browser UI and plugins

    javascript.options.jit.content -> for web content

    (you can also change the values)

    btw. if your code is a little complex don't expect to get a speed comparable to V8. Tracemonkey fails with branchy code (it may be slower than spidermonkey).

    More info: http://hacks.mozilla.org/2009/07/tracemonkey-overview/