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Debugging Firefox

Getting Started

  1. Get the code ./bin/prepare-mochitests-dev
  2. Go to the firefox directory cd firefox
  3. Build Firefox ./mach build see docs
  4. Run Firefox ./mach run see docs

Firefox Code Base

Firefox is a large project, but for the most part the relevant source code is in /devtools. The debugger client, is in /devtools/client/debugger/new.

Updating the Debugger

You can update the debugger by running yarn watch. The script will:

  • copy the debugger files
  • bundle dependencies into vendors
  • bundle workers

Remember, every time the code changes in firefox you need to re-run ./mach build!

Inspecting the Debugger in the Panel

Firefox has built the toolbox so that it is powerful enough to debug the Firefox. You can launch it with ./mach run --jsdebugger. When you do, you're using the "browser toolbox" and you can inspect and debug anything in the browser, including the Debugger.

Debugging the Debugger Server

The server code lives in /devtools/server. It can be a bit difficult to debug, so the best thing to do is to add log statements in the code with the special dump command e.g. dump(">> I am here\n"). When you do, you'll see the logs in the terminal and in the browser toolbox console.