Zen Browser Reopens Multiple Instances on Startup Even When Session Restore Is Disabled

[csmashe]

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?

When launching Zen Browser (Flatpak) on Pop!_OS, multiple browser windows reopen—equal to the number that were previously open—despite both "Open previous windows and tabs" and "Continue where you left off" being disabled in the settings.

Each window opens blank (no tabs restored), but all previously open instances return.

Expected behavior

Only a single window should open on startup when session restore settings are disabled.

Actual behavior

Multiple Zen Browser windows reopen at launch, even though: No tabs are restored, Session restore settings are explicitly disabled

Steps to reproduce

1. Open multiple Zen Browser windows (e.g., 4 or 5).
   

2. Close all windows via right-clicking the pinned icon and choosing "Close All Windows". 
   

3. Launch Zen Browser again using the pinned app icon.. 
   

4. Observe that all previously open windows return.
   

Screenshots and videos

No response

Version

1.14.5b (Firefox 140.0.4)

What platform are you seeing the problem on?

Linux (Flatpak)

What component is this issue related to?

Other

Relevant log output if applicable

[symphonic-navigator]

Can confirm.

Steps to reproduce in a different way (I do it on Hyprland, is probably the same otherwise):

If you close multiple windows too quickly then this happens.

If you take your time closing them (which, honestly, defeats the purpose of using a tiling WM) the extra windows on next startup are gone.

[tomhautier]

Same problem with i3.