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    Debugging

    Debugging a project as large as Mozilla can be a daunting task. Fortunately, over the years, Mozilla developers have come up with not just technologies and features to help you debug code, but have devised tips and techniques that can help too. Also available are assorted tools that you can use when debugging.

    Documentation topics

    Debugging on top of the Mozilla platform

    Debugging JavaScript code
    How to debug JavaScript code, with a focus on debugging code in the Mozilla project itself.
    Debugging a XULRunner application
    Tips and suggestions that will help you debug your XULRunner based application.
    Debugging on Boot to Gecko
    Debugging Firefox OS (apps and the platform itself)
    Debugging update problems
    Learn how to debug update problems in Mozilla-based applications.

    Debugging the Mozilla platform

    Using debuggers with Mozilla

    Debugging Mozilla on Windows FAQ
    Questions (and answers) about debugging Mozilla on Windows.
    Debugging Mozilla on OS X
    Questions (and answers) about debugging Mozilla on OS X.
    Debugging Mozilla with gdb
    gdb is our primary debugger on Mac and Linux.
    Debugging Mozilla with lldb
    lldb is the new debugger on Mac.

    Advanced debugging techniques

    Debugging Mozilla with valgrind
    valgrind is a memory debugger for Mac and Linux. It is slow, but good for tracking down difficult memory safety bugs.
    Replay debugging Firefox with VMWare Workstation
    How to setup record and replay debugging on Firefox, to help debug intermittent mochitest failures.

    Debugging specific parts of the Mozilla codebase

    Debugging OpenGL
    If you're working on code that involves OpenGL calls, and need to debug it, you can turn on a special OpenGL debugging mode.
    Debugging frame reflow and Debugging table reflow
    Notes on debugging issues in Gecko's layout engine.

    Miscellaneous

    Debugging Safari
    Some tips for debugging Safari
    Debugging Chrome
    Some tips for debugging Chrome
    Debugging Internet Explorer
    Some tips for debugging Internet Explorer

    Providing useful information to the Mozilla developers

    How to get a stacktrace for a bug report
    Useful information you can provide about a crash.
    Reporting a Performance Problem
    ...using the Gecko Profiler extension.
    Debugging a hang on OS X
    Collecting "samples" to attach to a bug.
    Remote debugging
    Core dumps and examples of remote debugging. Useful if a developer can't reproduce your crash.
    HTTP logging
    How to log HTTP network traffic for debugging purposes.

    Debugging tools

    Tools
    Assorted tools that will help you debug your code or web site.
    Download a debug build
    Recent automatically compiled debug builds are available. Note that these are replaced frequently by our tinderboxes. The debug builds have "-debug" at the end of their file names.
    Performance and profiling
    Troubleshooting performance problems.

     

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    Last updated by: nnethercote,