Re: Cannot recover lost session on Mac! Make sure you have Time Machine backups (or another recent backup)!! quit your Opera browser go to Library > Application Support, find and delete 'com.operasoftware.Opera' folder, open Time Machine, find a recent backup date before you've lost your tab session, locate 'com.operasoftware.Opera' folder in that backup, click on Restore, re-launch your Opera browser. Relax and smile now