[GNOME/Wayland] Browser Tabs does not focus Firefox window on another workspace

System information

• Version: v0.28.1 (e680237b0)
• Build info: GCC 16.2.1 - Release
• Provenance: copr
• OS: Fedora Linux 44 (Workstation Edition) - 44
• QT Platform: wayland
• DE: GNOME/Wayland

Describe the bug

When using Search Browser Tabs with Firefox on GNOME/Wayland, selecting a tab whose Firefox window is located on another GNOME workspace does not switch to that workspace or focus the Firefox window.

Instead, GNOME shows a notification indicating that the Firefox window is ready/active. Only after clicking that notification does GNOME switch to the workspace containing the target Firefox window.

The browser integration itself otherwise works: Vicinae can see and search Firefox tabs.

This is especially inconvenient when multiple Firefox windows are open on different GNOME workspaces, since the expected workflow is to search for a tab in Vicinae and immediately jump to the corresponding Firefox window.

To Reproduce

1. Run GNOME on Wayland.
2. Open a Firefox window on workspace 1.
3. Open another Firefox window on workspace 2.
4. Open different tabs in the two Firefox windows so they can be easily distinguished.
5. While on workspace 1, open Vicinae.
6. Run Search Browser Tabs.
7. Select a tab that belongs to the Firefox window on workspace 2.
8. Press Enter.

Expected behavior

Vicinae should:

1. activate the selected Firefox tab;
2. switch GNOME to the workspace containing that Firefox window;
3. focus the corresponding Firefox window.

Actual behavior

GNOME stays on the current workspace.

A GNOME notification appears indicating that Firefox is ready/active. Clicking that notification then switches to the other workspace and focuses Firefox.

Environment

• Fedora Linux 44
• GNOME Shell 50.4
• Wayland session
• Vicinae 0.28.1
• Vicinae commit: e680237b0
• Build: GCC 16.2.1 - Release
• Provenance: copr
• Vicinae GNOME extension: 1.7.2
• Firefox: 155.0
• Vicinae Browser Integration extension installed in Firefox

Additional context

The GNOME companion extension is installed and active. Clipboard integration works correctly, and Vicinae successfully connects to the GNOME extension over D-Bus.

The built-in Switch Windows command can focus Firefox windows on other GNOME workspaces correctly. The problem only occurs when switching through Search Browser Tabs.

The behavior looks similar to GNOME focus-stealing prevention: Firefox requests activation, but GNOME shows a "window is ready" notification instead of switching workspace/focusing the target window.

It may be related to the activation path used by Browser Tabs on GNOME/Wayland (for example, XDG activation), but I am not sure whether the appropriate fix belongs in Vicinae core, the browser integration, or the GNOME companion extension.