1954538 - [macOS] Extra Firefox icon briefly appears in the Dock when switching profiles

Status: VERIFIED FIXED

(Toolkit :: Startup and Profile System, defect)

Description

[Simona Badau, Desktop QA]

Attachment: Screen-Recording with the issue

Found in

• Nightly 138.0a1

Affected versions

• Nightly 138.0a1

Tested platforms

• Affected platforms: macOS 15
• Unaffected platforms: Windows 11

Preconditions

• Have at least one profile created with Profile Switching, eg "Profile 1"

Steps to reproduce

1. Open Profile 1.
2. Open the Original profile.
3. Switch between the 2 profiles using the Profiles section from the Hamburger menu.

Expected result

• Switching between the profiles should be smooth, with no additional Firefox icons appearing in the Dock.

Actual result

• An additional Firefox icon briefly appears and then disappears in the Dock.

Regression range

• This is not a regression; it's introduced with the Profile Switching feature.

Comment 1

[Jared Hirsch [:jhirsch] (he/him) (Needinfo please)]

non-blocker for 138

Comment 2

[Dave Townsend [:mossop]]

Attachment: Bug 1954538: Use the remoting service to activate other instances when possible. r=#profiles-reviewers!

Also replaces some of our handwritten mocks with sinon usage.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/2b9644efd4e4
Use the remoting service to activate other instances when possible. r=profiles-reviewers,jhirsch

Comment 4

[Sandor Molnar[:smolnar]]

Backed out for causing xpc failures @ test_delete_last_profile.js

Backout link: https://hg.mozilla.org/integration/autoland/rev/f8134d4488c2e332956194eadf8f370fbc390988

Push with failures

Failure log -> TEST-UNEXPECTED-FAIL | browser/components/profiles/tests/unit/test_delete_last_profile.js

Comment 5

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/298aa10942ea
Use the remoting service to activate other instances when possible. r=profiles-reviewers,jhirsch

Comment 6

[agoloman]

Backed out for causing bc failures @browser_test_profile_selector.js.

• Backout link
• Push with failures
• Failure Log

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/1857a759ae61
Use the remoting service to activate other instances when possible. r=profiles-reviewers,jhirsch

Comment 8

[Serban Stanca [:SerbanS]]

https://hg.mozilla.org/mozilla-central/rev/1857a759ae61

Comment 9

[BugBot [:suhaib / :marco/ :calixte]]

Since nightly and release are affected, beta will likely be affected too.
For more information, please visit BugBot documentation.

Comment 10

[BugBot [:suhaib / :marco/ :calixte]]

The patch landed in nightly and beta is affected.
:mossop, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.
  • See https://wiki.mozilla.org/Release_Management/Requesting_an_Uplift for documentation on how to request an uplift.
• If no, please set status-firefox139 to wontfix.

For more information, please visit BugBot documentation.

Comment 11

[Simona Badau, Desktop QA]

Verified as fixed using the latest Nightly 140.0a1 (Build ID: 20250505214727) on macOS 15 - the extra icon is no longer displayed when switching profiles.