mozilla/experimenter

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A web application for managing user experiments for Mozilla Firefox.

Stars: 151
Forks: 229
Open beginner issues: 13
Indexed issues: 409
Avg merge: 1d 8h
Merged PRs (30d): 212

Dominant language: Python
License: MPL-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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21 beginner-friendly issues open

[Rollout UI] Documentation link title errors are hidden for every link, not just newly added ones Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

mozilla/experimenter#17258 · Opened Sep 10, 2026
Fail CI on feature manifest errors Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

mozilla/experimenter#17133 · 1 comment · Opened Sep 3, 2026
STMO Link for Popsize query returns individual client rows instead of counts Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

mozilla/experimenter#17119 · Opened Sep 2, 2026
Sort selected features to top of list in feature config selector on branch page Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

mozilla/experimenter#16723 · Opened Aug 11, 2026
Development server missing some schemas with version=None Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

mozilla/experimenter#16586 · Opened Jul 31, 2026
Use UV dependency groups Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

mozilla/experimenter#16541 · Opened Jul 28, 2026
Use TestCase.assertDictEqual when comparing DRF serializer errors Open

Maintenance Task

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

mozilla/experimenter#16198 · Opened Jul 3, 2026
DecimalField max_value and min_value should be Decimal or int Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

mozilla/experimenter#16195 · Opened Jul 3, 2026
(staticfiles.W004) The directory '/experimenter/experimenter/legacy/legacy-ui/assets' in the STATICFILES_DIRS setting does not exist. Open

Difficulty 2/5 1-3 hours Newbie friendliness 66/100

mozilla/experimenter#16194 · Opened Jul 3, 2026
make generate_types is dead code Open

Difficulty 1/5 Under an hour Newbie friendliness 76/100

mozilla/experimenter#15887 · Opened Jun 10, 2026
Run cirrus tests with -vv Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

mozilla/experimenter#15843 · Opened Jun 8, 2026
"End Enrollment Early" is shown after the end of the observation period Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

mozilla/experimenter#15750 · 1 comment · Opened May 29, 2026
Localization field should not be displayed for non-desktop Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

mozilla/experimenter#15603 · Opened May 12, 2026
ios outcomes links to metric-hub docs are incorrect Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

mozilla/experimenter#15306 · Opened Apr 16, 2026
Add confirmation dialog to rollout checkbox Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

mozilla/experimenter#15233 · Opened Apr 13, 2026
Hard-coded experimenter_test container name causes conflicts between concurrent worktrees Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

mozilla/experimenter#14768 · Opened Feb 26, 2026
Bad link in rollout/audience/"Learn more" Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

mozilla/experimenter#12388 · Opened Mar 27, 2025
Typo in end enrollment error message Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

mozilla/experimenter#12347 · 2 comments · Opened Mar 19, 2025
constants.py includes broken link to ASRouterTargeting file Open

Difficulty 1/5 Under an hour Newbie friendliness 75/100

mozilla/experimenter#11345 · Opened Sep 11, 2024
Update mock config Firefox versions Open

Difficulty 1/5 Under an hour Newbie friendliness 86/100

mozilla/experimenter#9236 · Opened Aug 8, 2023
Sync Cirrus python versions in pyproject and docker Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

mozilla/experimenter#9145 · Opened Jul 20, 2023

mozilla/experimenter

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