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Gaia is a HTML5-based Phone UI for the Boot 2 Gecko Project
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Gaia Build Status

Gaia is Mozilla's Phone UX for the Boot to Gecko (B2G) project.

Boot to Gecko aims to create a complete, standalone operating system for the open web.

You can read more about B2G here:

follow us on twitter: @Boot2Gecko

join the Gaia mailing list:

and talk to us on IRC:

#gaia on

See INSTALL file in B2G repository for instructions on building and running B2G. To try out Gaia on desktop, see

Installing on different devices resolution

Currently supported screens

  • qHD: ~540×960, device pixel ratio = 1.6875
  • WVGA: ~480×800, device pixel ratio = 1.5

How to:

You need to set HIDPI=1 when using any make command


HIDPI=1 make reset-gaia HIDPI=1 make install-gaia HIDPI=1 BUILD_APP_NAME=contacts make install-gaia


Unit Tests

Unit tests for an app go in apps/<APP>/test/unit/.

To run all the unit tests with B2G Desktop:

  1. Run DEBUG=1 make
  2. Run make test-agent-server &
  3. Run B2G Desktop and open the Test Agent app
  4. Run make test-agent-test

    or make test-agent-test APP=<APP> to run unit tests for a specific app

More importantly, you can use test-agent-server to watch the files on the filesystem and execute relevant tests when they change:

  1. Run DEBUG=1 make
  2. Run make test-agent-server &
  3. Run B2G Desktop and open the Test Agent app
  4. Edit files and when you save them, glance at the console with test-agent-server running

Note: If you add new files, you will need to restart test-agent-server.

For more details on writing tests, see:

Integration Tests

Integration tests for an app are located in apps/<APP>/test/integration/.


  1. adb
  2. FirefoxOS Device / Emulator / B2G Desktop

To run integration tests:

  1. In your gaia/ directory, run make to build the profile
  2. Run B2G Desktop

    or forward port 2828 from your device / emulator using adb forward tcp:2828 tcp:2828

  3. Run make test-integration from the gaia/ directory

    or make test-integration APP=<APP> to run unit tests for a specified app

    or make test-integration TESTS=<PATH/TO/TESTFILE.js> to run unit tests in a specific file

    or make test-integration REPORTER=<REPORTER> to run integration tests with the specified reporter, for example XUnit

    or make test-integration TESTVARS=<PATH/TO/TESTVARS.json> to run tests with variables in the testvars file (this defaults to testvars.json)

Note: If you're using a FirefoxOS Device, it must have been flashed with a build with marionette enabled. If it doesn't have marionette enabled, then running make test-integration will time out.

The testvars file is a JSON file that maps app names to objects holding key/values as required by that app's integration tests. See that app's integration test code and/or README for which key/values are required.

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