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Welcome to the Automation and Tools Projects Page.

We are the people who write the code that enables all our automated test systems (correctness, performance etc) to run. We are continually expanding, upgrading, and inventing new and better ways to do automated quality analysis at Mozilla. Most of our systems run on a per-checkin basis, and at the time of this writing we do roughly 300 checkins a day, and we run hundreds of thousands of tests per checkin, so you can imagine how many times our code gets run. If you like the idea of that kind of a challenge, we could use your help on some of the projects below. If you don't know how to get started, feel free to hop on irc (, into the channel #ateam and ask some questions.

The Goals

See our goals page.

Other Projects

Every quarter there are more things we'd like to do than we have time for. Below are some of these projects, broken down by areas and technologies so that you can find something that gets you excited.


Work in progress effort to create an index for all existing/WIP automation tools - Here.

Firefox for Android

The Firefox for Android project is a continual expansion of our test harnesses to better support the Android platform. Currently we only release Firefox on that platform (aka Fennec), but we might also begin testing web apps there in the near future. Familiarity with Android and a great knowledge of Python is very useful here.

  • Help expand our reach to x86 Android systems by aiding us in debugging and fixing test failures on that platform: see the collection of bugs beneath bug 891959

Firefox Desktop and General Automation Support

The desktop web browser Firefox continues to be our flagship product, and there is always ongoing work needed to ensure that we continue to support the new features that regularly land in Firefox. Many of the bugs here are more tractable simply because the test harnesses and tests involved are older code. This is a good spot for first-time contributors. These will involve Python knowledge and some JavaScript, depending on the bug.


The a-team maintains many of the systems and code that perform per-checkin testing on performance. There are many performance automation systems at Mozilla, and one of our current efforts is to pull them under one high-level dashboard, called Perfherder. A working knowledge of the web, Python, JavaScript, statistics, and great debugging skills would be helpful.

Tools & Dashboards

We create web-based tools and dashboards to help illustrate how our automation is doing. Datazilla is a performance dashboarding system, and Treeherder surfaces the status of our automation runs. We also maintain and continually improve Mozilla's Bugzilla installation, often contributing patches to the upstream general Bugzilla project. Python, JavaScript, and, in Bugzilla's case, Perl, are all used here, along with both relational and NoSQL databases.

ATeam Handbook

The ATeam Handbook is meant to be the definitive source of information on how we do things in the ateam, useful for new and old contributors alike. Currently in the planning phase.

Mentored Bugs

These bugs are things that we have identified as great starter bugs. Each bug contains a focused technology that is required and a mentor who has volunteered to help out people starting to work on the issue. If you've done a few mentored bugs, talk to your mentors about becoming a mentor yourself!

Full Query
ID Summary Priority Status Bug mentor
682901 catch the case where .finish() gets called before waitForExplicitFinish() -- NEW No bug_mentor
847275 make assertions cause test failures in mochitest-browser-chrome -- ASSIGNED No bug_mentor
884828 mozinstall.get_binary() should check for executable bit and be less confusing -- ASSIGNED No bug_mentor
939755 With httpd.js we sometimes don't get the most recent version of the file -- ASSIGNED No bug_mentor
940882 Consolidate waitForCondition implementations and switch to using TestUtils.waitForCondition -- ASSIGNED No bug_mentor
958147 Choose one of run-if or skip-if and get rid of the other -- REOPENED No bug_mentor
969334 mozinstall should not magically try to find the mount point of the DMG -- NEW No bug_mentor
996652 Scope the private symbols of head.js -- NEW No bug_mentor
1028895 Mouseover triggered in mochitest-browser & dt according to position of mouse cursor on test box -- NEW No bug_mentor
1036328 Support bisection in case of timeout/crash -- NEW No bug_mentor
1036934 Add test for content editing keyboard shortcuts -- NEW No bug_mentor
1072912 Remove makefile targets for running tests from -- NEW No bug_mentor
1121710 Fix MenuBar class for correct handling of menus -- NEW No bug_mentor
1128997 Support indefinite script timeout P2 NEW No bug_mentor
1132057 [mozlog] HTML log should show the passed/failed tests on the top of the page as default -- NEW No bug_mentor
1137691 SpecialPowers.getFocusedElementForWindow is misnamed -- NEW No bug_mentor
1164443 Mozinstall should only install in an empty dir P1 NEW No bug_mentor
1176474 Mozregui: Add some tests -- NEW No bug_mentor
1177336 mozfile.remove uses excessive system calls -- NEW No bug_mentor
1191446 Create a mach command for rerunning failed jobs on a previous push using new code -- NEW No bug_mentor
1192866 Throw an exception when a non-top-level window is passed to synthesizeKey -- NEW No bug_mentor
1196305 [Qb] multiple groupby should string-join multiple columns, the aggregate? -- NEW No bug_mentor
1199700 add feature to make collecting nspr logs easier in reftest -- NEW No bug_mentor
1229089 Stop pre-processing reftest.js -- NEW No bug_mentor
1258664 Add more details about which chrome window handles are leaked in tearDown of a FirefoxTestCase -- NEW No bug_mentor
1273498 Update Puppeteer classes for MetaClass -- NEW No bug_mentor
1286894 Enable Treeherder to add new TC jobs for non try repositories -- NEW No bug_mentor
1295617 [marionette harness tests] Improve display of test ids for parametrized tests P5 NEW No bug_mentor
1298803 Add test to quit Firefox via a shortcut P5 REOPENED No bug_mentor
1298900 [marionette harness tests] Improve readability of tests/fixtures using `num_fails_crashed` P5 NEW No bug_mentor
1311429 Reftest harness should use mozcrash.kill_and_get_minidump -- NEW No bug_mentor
1317782 Running twice fails to set up Buildbot -- NEW No bug_mentor
1319793 [marionette harness tests] Default to not swallow stdout from pytest P5 NEW No bug_mentor
1337013 Make gtest mach command invoke -- NEW No bug_mentor
1348145 Remove getWindowPosition/setWindowPosition and getWindowSize/setWindowSize P3 ASSIGNED No bug_mentor
1354458 Get rid of `self.wait_for_condition()` in favor of `Wait().until()` P3 ASSIGNED No bug_mentor
1373563 Mozscreenshots: intermittent controlCenter_localFile on Windows 10 P3 ASSIGNED No bug_mentor
1385706 WebDriver:TakeScreenshot uses document element’s clientWidth/clientHeight instead of viewport dimensions P2 NEW No bug_mentor
1397417 [tracking] Convert mozbase unittests to pytest P3 NEW No bug_mentor
1397853 Enable py2 and py3 linter on testing/mochitest -- ASSIGNED No bug_mentor
1399394 Support code coverage builds on Mac -- NEW No bug_mentor
1400233 Drop ContentWebElement.LegacyIdentifier from Marionette P3 REOPENED No bug_mentor
1403677 [meta] Implement support for cropping of screenshots -- NEW No bug_mentor
1406006 Build SHA1 incorrectly displayed when built in hg repository P3 NEW No bug_mentor
1408042 Fix Marionette xpcshell tests for inappropriate use of errors in Assert.throws() P3 ASSIGNED No bug_mentor
1408754 Add configuration to send page to about:tabcrashed -- ASSIGNED No bug_mentor
1414320 Recognise well-understood platform names P2 NEW No bug_mentor
1420372 Marionette client has to check for a valid pid of Firefox as returned with the capabilities P3 NEW No bug_mentor
1422606 Mozregression GUI please add support for --arg -- NEW No bug_mentor
1423103 Improve failure messages for invalid capability configurations P3 ASSIGNED No bug_mentor
1423899 Remove dependency to pageSource* HTML testcase files in P3 NEW No bug_mentor
1441437 Remove dependency to cssTransform.html and cssTransform2.html in P3 ASSIGNED No bug_mentor
1443572 Disable onboarding when using Marionette P3 ASSIGNED No bug_mentor
1453292 Remove Webdriver command "ElementTap" P3 ASSIGNED No bug_mentor

54 Total; 54 Open (100%); 0 Resolved (0%); 0 Verified (0%);

For reference, the old Projects Page (which is largely out of date, but interesting for historical reasons) is accessible here