Make sure that you do not use Clear Recent History to clear the Browsing History when you close Firefox.

• https://support.mozilla.com/kb/Clear+Recent+History

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.com/kb/Safe+Mode

First, I checked to make sure that I did not have Clear Recent History set, and I did not.

Then, I opened in Safe Mode, changed Appearance to default, closed, and restarted Firefox. The Default appearance was back, but when I clicked on Restore Previous Session, nothing happened.

Do you have any other suggestions? Thanks.

Try to delete the file chromeappsstore.sqlite in the Firefox Profile Folder.

• Help > Troubleshooting Information > Profile Directory: Open Containing Folder

• http://kb.mozillazine.org/Profile_folder_-_Firefox

I followed your directions exactly, going through the Help menu, etc, and deleted chromeappsstore.sqlite. I closed Mozilla and restarted it, but it still will not restore my previous session.

Thanks for your continued help.

Is the "History > Restore Previous Session" menu entry enabled or is that grayed?

If that entry is enabled then that means that a previous session is available.

If there is a problem with the "Restore Previous Session" not working then deleting the chromeappsstore.sqlite file should fix that.
Otherwise try This setting:

• Tools > Options > General > Startup: "When Firefox Starts": "Show my windows and tabs from last time"

When I went to History>Restore Previous Session, I found it was enabled and was able to get my last set of tabs to open just by clicking on it. I was not able to open them using the link in the middle of the home scree, but you gave me a simple way of accessing my last session. I thank you very much.