Is your Firefox set to clear history when you close it? Here's where to check on that: Open the Settings page (menu button > Settings) and click Privacy & Security in the left column. Scroll down to the History section. There are three main options: * Firefox will: Remember history * Firefox will: Never remember history => this would definitely cause your problems * Firefox will: Use custom settings for history => we need to review the settings With Custom Settings shown: [_] Always use private browsing mode => must NOT be checked if you want to restore your previous session [X] Remember browsing and download history => must be checked if you want to restore your previous session [?] Remember search and form history => does not affect this issue [?] Clear history when Firefox closes => if you enable this, we need to review the detailed settings: - History => do not clear if you want to restore your session - Cookies and site data => do not clear if you want to stay signed in to sites - Temporary cached files and pages => any setting is okay - Site settings => do not clear Did you notice any problem settings?