Go to about:preferences, check "Warn me when closing multiple tabs". Then attempt to close firefox
That is scary, but it works. Nice to have you back.
Re RESTORE does not open closed tabs after a crash:
1. slightly possible that two new browsing sessions were opened instead of one so I need the ante-previous session restored (two back).
2. alt>history>show all history>import and backup>restore> [choose] today =This shows today's date on the list with the number of tabs that were closed (I won't tell you how many
)>[press] OK = This gives "This will replace all of your current bookmarks with the backup. Are you sure?"
After pressing OK, I don't see any tabs on the screen. Why does the message change the word from 'tabs' in history to 'bookmarks'?