1879280 - Pin/Unpin Firefox to the taskbar became unresponsive after an update

Status: NEW

(Firefox :: Shell Integration, defect)

Description

[Timea Zsoldos [:zstimi/tzsoldos], Desktop QA]

Found in

• Firefox 124.0a1

Affected versions

• Firefox 124.0a1

Tested platforms

• Affected platforms: Windows 11 aarch, Windows 10 x86, Windows 10 x64, Windows 11
• Unaffected platforms: Ubuntu, macOS

Preconditions

• browser.taskbar.lists.legacyBackend=false (this is the default settings on nightly Firefox 124.0a1)

Steps to reproduce

1. Install an old Firefox nightly build (ex. firefox-121.0a1.en-US.win64-aarch64.installer.exe) on a clean profile and run it.
2. Pin Firefox icon to the taskbar.
3. Update Firefox to its latest version.
4. Close Firefox then click on the pinned icon from taskbar and open Firefox.
5. Right click on the Firefox taskbar icon to unpin and pin to taskbar multiple times.

Expected result

• Pin/Unpin is functional.

Actual result

• Pin/Unpin become unfunctional after the first attempt and the Windows Jump List not appear anymore.

Regression range

• I'm not sure if it's a regression or not, I will come back with regression range ASAP.

Additional notes

• After restarted Firefox again, can be pinned and unpinned one more time the icon to the taskbar, but after this the pin/unpin button become unresponsive.
• Tested with Firefox 120.0b9, updated to Firefox 123.0b8 pin/unpin remain responsive, then setting browser.taskbar.lists.legacyBackend to false, restart the browser, Firefox pin/unpin to the taskbar remain functional.

Comment 1

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

:zstimi, if you think that's a regression, could you try to find a regression range using for example mozregression?

Comment 2

[Timea Zsoldos [:zstimi/tzsoldos], Desktop QA]

It is not a nightly regression, tested on Firefox 99.0a1 (build from 2022.02.15), Firefox 111.0a1 the issue reproduces on very old builds.
Also reproduced on Windows 10 X64 and on Windows 11 x64 using Firefox nightly zip builds (124.0a1).