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debugging - Fastest way to debug Firefox addons during development

Debugging a Firefox addon is a slow process: (1) edit source code in a JS editor (2) package into XPI using a build script (3) drag into Firefox to install (4) restart Firefox (5) open the JavaScript Debugger

Can we speeden up the process? Like install it into Firefox without a restart, or configure the build script to install it into Firefox as well?

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You'll want to locate your profile folder. Once you find it, go into the folder called 'extensions', and then locate the folder for the add-on you are working on. Replace that folder with a file of the same name (minus .xpi if that's part of the name), and inside the file place the full path to your source directory of the add-on.

In Linux and Mac, that'll look like:

/full/path/to/yourExtension/

And on Windows:

C:fullpathoyourExtension

Remember the trailing slash and beware of extra whitespace.

As long as you don't use jar files inside your add-on, you will no longer have to rebuild (this is covered in a bit more depth here).

Additionally, you'll want to set nglayout.debug.disable_xul_cache to true. For edits to xul or js files, you'll just have to open up a new window to see your changes instead of restarting the application. There are other preferences here that you may find useful as well.

Extra tips:

  • Starting firefox with a certain profile (dev), while other firefox profile is open and with the debugger already on:

    "C:Program Files (x86)Mozilla Firefoxfirefox.exe" -no-remote -P dev -jsconsole

  • Check out the restart addon (saves time).


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