[Bug]: All windows, tabs and workspaces get deleted after closing.

[FlutterFraz]

Pre-Submission Checklist

• [X] I have checked the existing/closed issues to ensure this issue has not already been reported.
• [X] I am using the latest supported version of the browser.
• [X] I have tried disabling all browser extensions/add-ons to rule out interference from these.
• [X] I have tried clearing the browser cache and cookies.
• [X] I have checked with a new profile and the issue still occurs.
• [X] I have provided detailed step-by-step instructions on how to reproduce the issue.
• [ ] I have included relevant screenshots or console outputs.
• [X] I have checked that this problem is not occurring in the latest version of Firefox ESR.
• [X] This issue is specific to this browser and does not occur in other browsers.

Bug Summary

Simply put, from the last update, 11.20.0(64 bit) | Firefox128.5.0, all my profiles suffer from this. All windows, tabs and workspaces get deleted after closing. Only performing a reboot from the burger menu saves them.

Reproduction Steps

1. Have some tabs and/or windows and/or workspaces open
2. Close the browser
3. Reopen the browser

Expected Behavior

Tabs, windows and workspaces still present

Actual Behavior

Tabs, windows and workspaces not present

Screenshots

Browser Version

11.20.0(64 bit)

Operating System

Windows 11 Home 23H2

Additional Context

No response