mozilla-mobile/reference-browser

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A full-featured browser reference implementation using Mozilla Android Components.

Stars: 664
Forks: 195
Open beginner issues: 0
Indexed issues: 362
Avg merge: 14h 53m
Merged PRs (30d): 63

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

Beginner friendly Everything

Open All

362 open issues indexed

The links mentioned in project's README for downloading the latest project APKs point to outdated builds Open

🐞 bug

Difficulty 1/5 Under an hour Newbie friendliness 55/100

mozilla-mobile/reference-browser#4174 · Opened Mar 9, 2026
Navbar on top of address bar Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla-mobile/reference-browser#4072 · Opened Jan 8, 2026
Permafailing Nightly unit test job Open

🐞 bug

mozilla-mobile/reference-browser#4028 · 1 assignee · Opened Dec 19, 2025
Snackbars have wrong anchoring / padding Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

mozilla-mobile/reference-browser#3746 · 1 comment · Opened Jul 29, 2025
File Input Tag Not Working in Browser App Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#3083 · 1 comment · Opened Sep 12, 2024
Open sent tabs in the app Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#2538 · Opened Oct 19, 2023
[Bug] Can't open `select` element dropdown in web page using SystemEngine instead of GeckoEngine Open

🐞 bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#2280 · 1 reaction · Opened Apr 11, 2023
Intermittent many test failures, e.g. java.lang.NoClassDefFoundError: org.mozilla.appservices.places.GleanMetrics.PlacesManager Open

eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#2155 · Opened Dec 20, 2022
Permanent ui-test-arm failure of fileDownloadTest Open

eng:disabled-test eng:intermittent-test

Difficulty 3/5 1-2 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#2130 · 4 comments · Opened Dec 2, 2022
Decision task failure with latest `decision-mobile` image Open

eng:automation

Difficulty 4/5 3-5 days Newbie friendliness 30/100

mozilla-mobile/reference-browser#2128 · 4 comments · Opened Dec 1, 2022
Intermittent UI test failure - < ThreeDotMenuTest. reportIssueTest > Open

eng:intermittent-test eng:ui-test

Difficulty 2/5 1-3 hours Newbie friendliness 30/100

mozilla-mobile/reference-browser#2094 · 6 comments · Opened Nov 10, 2022
Intermittent UI test failure - < ThreeDotMenuTest. doShareTest > Open

eng:intermittent-test eng:ui-test

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla-mobile/reference-browser#2093 · 4 comments · Opened Nov 10, 2022
As a developer, I would like an example of how to place the toolbar at the top of the screen so that I can easily add a toolbar position switch to my settings (like Fenix) Open

🌟 feature

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#2091 · 1 reaction · Opened Nov 9, 2022
Intermittent UI test failure - < ThreeDotMenuTest. privateBrowsingTabNavigationTest > Open

eng:disabled-test eng:intermittent-test eng:ui-test

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla-mobile/reference-browser#2085 · 11 comments · Opened Nov 7, 2022
Rename master to main Open

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

mozilla-mobile/reference-browser#2065 · 2 reactions · Opened Oct 26, 2022
Intermittent UI test failures due to ANR Open

eng:intermittent-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1996 · 9 comments · Opened Aug 26, 2022
Intermittent UI test failure - openNewPrivateTabTest Open

eng:disabled-test eng:intermittent-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 20/100

mozilla-mobile/reference-browser#1923 · 6 comments · Opened Jun 13, 2022
Tracking UI Tests disabled with frequent ANR [API 30] Open

eng:disabled-test eng:intermittent-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1886 · Opened May 3, 2022
Intermittent UI test failure - org.mozilla.reference.browser.ui.ContextMenusTest - openLinkInPrivateTabTest,openLinkInNewTabTest - Native crash of org.mozilla.reference.browser.debug Open

💥 crash eng:intermittent-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1812 · 6 comments · Opened Feb 10, 2022
Intermittent UI test failure - < MediaPlaybackTest.videoPlaybackTest> Open

eng:intermittent-test eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1806 · 6 comments · Opened Feb 7, 2022
Intermittent UI test failure - org.mozilla.reference.browser.ui.CustomTabsTest.customTabOpenInBrowserTest - androidx.test.espresso.NoMatchingViewException Open

eng:intermittent-test eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla-mobile/reference-browser#1775 · 2 comments · Opened Jan 3, 2022
Intermittent UI test failure - aboutReferenceBrowserTest Open

eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla-mobile/reference-browser#1752 · Opened Dec 10, 2021
Intermittent UI test failure - AddonsTest.removeAddonTest Open

eng:intermittent-test eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mozilla-mobile/reference-browser#1710 · 11 comments · Opened Nov 4, 2021
[Bug] java.lang.IllegalStateException: SET SESSION: Current activity: BrowserActivity hashcode 93128122 Other activity: ExternalAppBrowserActivity hashcode 49029772 Open

🐞 bug 💥 crash eng:bug-auto-found

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1675 · 3 comments · Opened Aug 26, 2021
Intermittent UI test failure - TabTrayMenuTest.closeOneTabXButtonTest Open

eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1674 · 1 comment · Opened Aug 25, 2021
[Bug] Media notification controls missing after pause/play Open

🐞 bug Feature:Media

Difficulty 3/5 1-2 days Newbie friendliness 42/100

mozilla-mobile/reference-browser#1660 · Opened Aug 18, 2021
Intermittent UI test failure - ThreeDotMenuTest.openSyncedTabsTest Open

eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1654 · 7 comments · Opened Aug 17, 2021
Intermittent UI test failure - <ReaderViewTest.verifyReaderViewDetectionTest> Open

eng:intermittent-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1652 · 10 comments · Opened Aug 16, 2021
[Bug] Crash when trying to run UI automated tests on a physical device Open

🐞 bug 💥 crash

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1648 · 1 comment · Opened Aug 4, 2021
[Bug] The previously visited websites link disappears after tapping the URL bar Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1641 · 1 comment · Opened Jun 30, 2021
Intermittent UI test failure - <AddonsTest.installAddonTest> Open

eng:intermittent-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1583 · 8 comments · Opened May 10, 2021
Intermittent build failure: Execution failed for task ':app:packageNightly'. - java.io.IOException: Execution of compression failed. Open

🐞 bug

Difficulty 4/5 3-5 days Newbie friendliness 20/100

mozilla-mobile/reference-browser#1550 · Opened Apr 19, 2021
Intermittent UI test failure - <AddonsTest.verifyAddonElementsTest> Open

eng:intermittent-test eng:ui-test

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1522 · 11 comments · Opened Apr 7, 2021
Intermittent UI test failure - <SettingsViewTest.openFXAQrCodeTest> Open

💥 crash eng:disabled-test eng:ui-test

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1502 · Opened Mar 30, 2021
Intermittent automation test failure: Could not find lint-gradle-27.0.1.jar (com.android.tools.lint:lint-gradle:27.0.1). Open

🐞 bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1423 · Opened Jan 15, 2021
Reference browser crashes when gfx.webrender.software is enabled Open

🐞 bug 💥 crash

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1366 · Opened Nov 11, 2020
Launcher shortcut for downloaded files not working Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mozilla-mobile/reference-browser#1356 · 5 comments · Opened Oct 27, 2020
what ever I type in the address bar vanishes after 1 sec. Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1336 · Opened Oct 3, 2020
Intermittent ui-test failure org.mozilla.reference.browser.ui.ThreeDotMenuTest refreshPageTest Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1314 · 2 comments · Opened Sep 11, 2020
Add Container Tabs to Reference Browser Open

Feature:Containers

mozilla-mobile/reference-browser#1308 · 4 comments · 9 reactions · 1 assignee · Opened Sep 4, 2020
Fill link from clipboard remains displayed in the upper part of the device Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 38/100

mozilla-mobile/reference-browser#1299 · Opened Aug 26, 2020
Add-ons - The edges of the add-ons icon are black Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1297 · Opened Aug 26, 2020
Flicker of the virtual keyboard when rapidly tapping on navigation bar in a new tab Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 42/100

mozilla-mobile/reference-browser#1286 · Opened Aug 11, 2020
Intermittent RuntimeError: Gradle command returned error: -6 or 1 after Cannot allocate memory Open

🐞 bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1269 · Opened Jul 17, 2020
Google Tag Manager causes video to stall Open

🐞 bug webcompat

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1240 · 3 comments · Opened Jun 19, 2020
Private browsing link does nothing Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla-mobile/reference-browser#1233 · Opened Jun 16, 2020
Intermittent build failure Execution failed for task ':app:packageDebug'. | java.lang.OutOfMemoryError (no error message) Open

🐞 bug

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla-mobile/reference-browser#1224 · Opened Jun 8, 2020
Opening and closing Synced Tabs crashes Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla-mobile/reference-browser#1217 · Opened Jun 2, 2020
Grayish layout on twitch.tv when changing the video's progress Open

🐞 bug Feature:Media

Difficulty 4/5 3-5 days Newbie friendliness 28/100

mozilla-mobile/reference-browser#1214 · 1 comment · Opened May 29, 2020
Download notification/snackbar is missing from the app Open

🐞 bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla-mobile/reference-browser#1212 · Opened May 29, 2020

mozilla-mobile/reference-browser

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