Title: Restore Firefox Session Subject: Restore session from a crash, lost or corrupt session. Firefox keeps that backup session in one of 2 files: sessionstore.bak sessionstore.js One of them has the data you want Firefox reads the sessionstore.js when it starts. You will need to backup both to a temp directory first, because firefox will over write them. Location is nice and standardized: On Linux: ~/.mozilla/firefox/.default/sessionstore.js On OsX: /Library/Application Support/Firefox/Profiles/.default/sesionstore.js On Windows: I'm not finding the location of this on windows... but it is there.