FF-desktop: Launch behavior when using Windows virtual desktop

[pih]

Summary:
When using Firefox across multiple virtual desktops in Windows, opening a web link via the Windows Run command causes an unwanted switch to a different virtual desktop if Firefox is already running there.

Steps to Reproduce:

1. Set up two virtual desktops (Desktop 1 and Desktop 2) in Windows.
2. On Desktop 2, open Firefox.
3. Switch back to Desktop 1.
4. Use the Windows Run command (Win+R) on Desktop 1, type a URL (e.g., www.google.com), and press Enter.

Expected Behavior:
The URL should open in a new Firefox window on the current desktop (Desktop 1), or if Firefox is already running on Desktop 1, it should open a new tab in that instance. The current virtual desktop should remain active, and the system should not switch to another desktop.

Actual Behavior:
Instead of staying on Desktop 1, Windows switches to Desktop 2, where Firefox is already open, and the URL is loaded in a new tab. This forces the user to leave their current workspace on Desktop 1.

Proposed Solution:
Firefox should either:

• Open a new instance of Firefox on the current virtual desktop (Desktop 1) if Firefox is not already running there, or
• Open a new tab in the existing Firefox window on the current desktop, avoiding the switch to another virtual desktop.

[Jon]

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