Note: This page covers required steps to incrementally update a bleeding-edge, development version of Firefox for Desktop. We use watchman to monitor filesystem changes and automatically generate the changed build outputs.
If you're having difficulty following this documentation, or hit a roadblock, please contact:
This not only helps us solving your difficulty, but often those who come after you. For more information, see the general Firefox build documentation.
Incremental builds with filesystem watching
Firefox for Desktop supports a fast build build modem called artifact mode. When you're using artifact mode, you can opt-in to an even faster incremental front-end build process.
- Be using artifact builds.
- Be building Firefox for Desktop.
- Have successfully built Firefox for Desktop.
- Have watchman installed.
Incremental front-end builds require the
pywatchman wrapper around
watchman to be installed. To verify that you have
watchman installed, ensure that
watchman --version succeeds.
Most Desktop developers on Mac OS X or Linux should find:
just works. This incrementally rebuilds local JS, CSS, and packaged files, including images.
Windows developers may have a more difficult time. We're working on smoothing out the kinks for Windows developers, and would appreciate working through problems with you.
Quick Restart workflow
mach watch and the developer-only Quick Restart key binding reduces the time of each edit-compile-run cycle. In a terminal, run
./mach build # (Capture changes to the build system -- only needed once!) ./mach watch
And in a second terminal, run
Here's an example of using Quick Restart to replace the current browser process with one reflecting changes to
Things that are supported
Most things updated by
mach build faster should also work with
Things not supported
- Modifying build system configuration and definitions, including
mach watch, run
mach build fasterto pick up the changes to the build system itself, and restart