Are you in permanent private browsing mode?

• How do I restore my tabs from last time?
• Restore previous session - Configure when Firefox shows your most recent tabs and windows

No, regular mode.

I've noticed that I can access previously closed by clicking on the 3-bar icon in the upper right corner and selecting "history" to get the list.

I updated to version 35.0.1 this morning. Unfortunately, the right-click on tabs and clicking on "Recently Closed Tabs" still doesn't work.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

You can check browser.sessionstore.* prefs on the about:config page and reset browser.sessionstore prefs that are user set (bold) via the right-click context menu to the default value to make sure that Session Restore is enabled and working properly.

• http://kb.mozillazine.org/Session_Restore
• https://support.mozilla.org/kb/restore-previous-session
• http://kb.mozillazine.org/browser.sessionstore.resume_from_crash

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

When I restart Firefox in "safe mode", I noticed I didn't have the "Recently Closed Tabs" available. A-HA!

The option comes from the add-on "Tab Utilities", which has not been updated since April 2014.

Thank you for your help!

After getting in contact with the developer, here is a link to the latest fixes for "Tab Utilities": https://github.com/yfdyh000/tabutils/releases

Hope this helps someone.