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Extension not seeing tabs in deselected workspaces #8989

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@subaieyazeed

Description

@subaieyazeed

Preliminary Checks

  • I have read and understood the important section above.
  • I have searched existing issues and avoided creating duplicates.
  • I am not filing an enhancement request.
  • I have checked that this issue cannot be reproduced on Mozilla Firefox.
  • I have checked that this issue can be reproduced once I removed all my Mods and Custom CSS.

What happened?

The extension is called "Tab Session Manager" it's a popular extension along with other similar ones, it auto saves sessions and tabs periodically and you can reopen them later, I found that it only recognizes and saves the open tabs and windows in the active visible workspaces only. I provided examples:

Screencast_20250612_164124.webm

As you can see, it only saves the visible workspaces.

Expected behavior

All tabs including the invisible ones in the deselected workspaces should be saved and recognizable by extentions.

Actual behavior

The extention only recognizes the visible tabs in the selected active workspaces only.

Steps to reproduce

1- Use an extension that interacts with tabs or sessions to manage them, in provided example the extention is called "Tab Session Manager" it's one of the most used extentions for Firefox.
2- Open tabs in two different workspaces on the same window.
3- Select one of the workspaces.
4- Test the extension functionality.
5- The extension will not correctly recognize the tabs in the currently deselected workspace.

Screenshots and videos

The video was included in the first post and this is it again:

Screencast_20250612_164124.webm

Version

1.12.10b (Firefox 139.0.1) (64-bit) AUR Arch Linux.

What platform are you seeing the problem on?

Linux (Tarball), Other

What component is this issue related to?

Extensions

Relevant log output if applicable

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