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    xpcshell

    xpcshell is an XPConnect-enabled JavaScript Shell. It is a console application that lets you run JavaScript code. Unlike the ordinary JS shell (js), xpcshell lets the scripts running in it access XPCOM functionality.

    Prerequisites

    You need your own build of Mozilla to use xpcshell.

    Running xpcshell

    ./run-mozilla.sh ./xpcshell
    

    xpcshell is almost always in the same directory as run-mozilla.sh.

    $ locate run-mozilla.sh
    /usr/lib/firefox-0.10.1/run-mozilla.sh
    /usr/lib/thunderbird-0.9/run-mozilla.sh
    /usr/local/mozilla/run-mozilla.sh
    /opt/mozilla/run-mozilla.sh
    /root/.Trash/mozilla/run-mozilla.sh
    

    Just pick one, cd over there, and run-mozilla.sh xpcshell, if it's present. (However, it might not be there if you have a non-debug version of Firefox, Mozilla, Thunderbird, etc.)

    $ cd /opt/mozilla
    $ ./run-mozilla.sh ./xpcshell
    js> 
    

    Using the Latest Version of Javascript

    At present, xpcshell doesn't use the latest version of JavaScript, so newer language features, such as the let statement introduced in JavaScript 1.7, are not available. To rectify this, run xpcshell with the -v 180 command-line option, which tells xpcshell to use JavaScript 1.8.

    Example

    You can input JavaScript, straight to Mozilla.

    js> 5+7
    12
    js> print("Hello, world!")
    Hello, world!
    js>
    

    See also