1966586 - The tab strip can still be displayed in a Taskbar Tab window

Status: VERIFIED FIXED

(Firefox :: Shell Integration, defect, P3)

Description

[Alex Cornestean]

Affected Version:
Nightly - 140.0a1/20250514211700

Description:
The tab strip can still be displayed in a Taskbar Tabs window when accessing a link which opens a page in a new tab.
For example, opening https://www.wikipedia.org/ in a Taskbar Tabs window and clicking on the “Get it on Google Play”/”Download on the App Store” buttons at the bottom left of the page will open a new tab with the respective pages inside the Taskbar Tabs window. As a result, the tab strip will appear. Clicking the “+” to create a new tab will open the new tab in the main Firefox instance though and not in the Taskbar Tabs window.

Steps to reproduce:

1. Open https://www.wikipedia.org/ in a Taskbar Tabs window
2. Click on any of the “Get it on Google Play”/”Download on the App Store” buttons at the bottom left of the page
3. Notice the tab strip appear as the pages corresponding to the “Get it on Google Play”/”Download on the App Store” links will open in a new tab inside the Taskbar Tabs window
4. Click on the “+” to create a new tab
5. Notice that the new tab is created in the main Firefox instance

Actual results:
The tab strip appears in the Taskbar Tabs window.

Expected results:
The tab strip should be disabled in the Taskbar Tabs window and should not allow for the creation of tabs.

Comment 1

[Max Christian Pohle [:/dev/max]]

I am redirecting this to the Core team because I think they are responsible for Progressive Web Applications. However, I am also uncertain which component fits best.

Comment 2

[Max Christian Pohle [:/dev/max]]

^ Sorry, my mistake.

Comment 3

[Duncan McIntosh [:dmcintosh]]

Attachment: Bug 1966586 - Reuse other browser windows when opening _blank links in Taskbar Tabs windows. r=nrishel!

This doesn't affect other tab additions, nor does it stop the tab bar from
appearing altogether. The idea is that if another tab is somehow made,
the user should see it; but we should not create new tabs if we can avoid
it.

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://github.com/mozilla-firefox/firefox/commit/fe64c04df918
https://hg.mozilla.org/integration/autoland/rev/9ccc6a2267cb
Reuse other browser windows when opening _blank links in Taskbar Tabs windows. r=nrishel

Comment 5

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/9ccc6a2267cb

Comment 6

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

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

Comment 7

[Alex Cornestean]

Verified as Fixed. Tested on the latest Nightly (142.0a1/20250709215737).

As per the STR from Comment 0, once the respective buttons are clicked, the tabs will open in the main Firefox instance and not in the Taskbar Tabs window, thus no longer making the tab strip appear in the Taskbar Tabs window.

If the main browser window is opened but not focused, the main window will get focused and then the tabs will open there.

If the main bowser window is closed, clicking the links in the Taskbar Tabs window will launch the main browser and open the links there.

This behavior is true for both cases when the Taskbar Tabs window is pinned and not pinned to the taskbar.

Comment 8

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

The patch landed in nightly and beta is affected.
:dmcintosh, 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-firefox141 to wontfix.

For more information, please visit BugBot documentation.