1976660 - Moving a tab to a new window on Linux Mint 22 results in the window disappearing completely and is never accessible but still active.

Status: UNCONFIRMED

(Firefox :: Tabbed Browser, defect)

Description

[d.alba.work]

Attachment: 2025-07-10 08-48-59.mkv

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Steps to reproduce:

1. Have multiple tabs open.
2. For a given tab, double-click it and move it so as to create a new Firefox window (i.e., removing the tab from the current window and placing it into one on it's own).

Actual results:

The rest of the tabs (i.e., not the selected tab) disappear and remain open as seen by the "View Recent Browsing Across Windows and Devices" section of the tab-bar, but the window itself disappears and cannot be selected. The only way to recover the tab(s) is by selecting "Open in New Window" from the open tabs section in the settings.

Expected results:

The tab that is double-clicked and moved should be opened in a new tab, the rest should remain in their original spot.

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Firefox::Session Restore' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Negritas Sergiu, Desktop QA]

Hello! I have tried to reproduce the issue with firefox 142.0a1(2025-07-11) on Ubuntu 22.04, unfortunately I wasn't able to reproduce the issue.
Could you please answer the following questions in order to further investigate this issue

1. Does this issue happen with a new profile? Here is a link on how to create one: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

Comment 3

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

Redirect a needinfo that is pending on an inactive user to the triage owner.
:dwalker, since the bug has recent activity, could you have a look please?

For more information, please visit BugBot documentation.

Comment 4

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

The severity field is not set for this bug.
:kcochrane, could you have a look please?

For more information, please visit BugBot documentation.

Comment 5

[Kelly Cochrane [:kcochrane]]

Sorry kinda unclear on if this is a Firefox View issue or an issue with the new window itself?

Comment 6

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

The severity field is not set for this bug.
:sclements, could you have a look please?

For more information, please visit BugBot documentation.

Comment 7

[Sarah Clements [:sclements]]

(In reply to d.alba.work from comment #0)

Created attachment 9499765 [details]
2025-07-10 08-48-59.mkv

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Steps to reproduce:

1. Have multiple tabs open.
2. For a given tab, double-click it and move it so as to create a new Firefox window (i.e., removing the tab from the current window and placing it into one on it's own).

Actual results:

The rest of the tabs (i.e., not the selected tab) disappear and remain open as seen by the "View Recent Browsing Across Windows and Devices" section of the tab-bar, but the window itself disappears and cannot be selected. The only way to recover the tab(s) is by selecting "Open in New Window" from the open tabs section in the settings.

Expected results:

The tab that is double-clicked and moved should be opened in a new tab, the rest should remain in their original spot.

As Kelly has mentioned, these STR are confusing and its not clear what the problem is. If you move a selected tab into its own window, tabs in the first window should not disappear. Is the problem with the window itself or with what you're wanting to see in firefox view?