Create a new profile and see if the issue persists.

I have been using tab session manager addon for this.

I just closed this and reopened it, so i have not this problem.

Something to try based on DeepSeek AI answer:

1. Adjust Session Save Frequency Firefox saves sessions periodically. Increase the save frequency to capture recent changes:

• Type about:config in the address bar and accept the risk.
• Search for browser.sessionstore.interval.
• Change the value from 15000 (15 seconds) to 5000 (5 seconds).

2. Ensure Session Restore is Enabled Verify these settings in about:config:

• browser.startup.page → Set to 3 (restores last session).
• browser.sessionstore.resume_from_crash → Set to true.
• browser.sessionstore.privacy_level → Set to 0 (stores all data; privacy-focused builds like LibreWolf may default to 2, which blocks session storage).

3. Disable Conflicting Extensions Privacy/security add-ons (e.g., Cookie AutoDelete, uBlock Origin in hard mode) might block session storage. Test in Safe Mode:

• Go to Menu → Help → Restart with Add-ons Disabled.
• If sessions restore correctly, an extension is causing the issue.

4. Check LibreWolf’s Privacy Settings LibreWolf tweaks Firefox for privacy, which can interfere with session restore:

• Go to Settings → Privacy & Security.
• Ensure Clear history when Firefox closes is unchecked.
• Under Permissions, ensure Allow websites to save cookies and site data is enabled.