Changes

This page will explain how to set up a development environment and start looking at the code. It has a walkthrough for you to try making a change to Firefox code on your local machine, so that you can see that change reflected in a copy of the browser.  It may take a few hours to go through this one-time setup. Not because it's particularly hard, but because the download and build can take a while. While the build is happening, you can look at bugs in Bugzilla, or read info for developers new to Mozilla on the Mozilla Developer Network.  Build instructions for other Mozilla stuff that isn't desktop Firefox can be found here:  https://developer.mozilla.org/en-US/docs/Developer_Guide/Build_Instructions