hi, as a starting point you could refer to http://kb.mozillazine.org/Session_Restore. do you still have particular questions after that?

Take a look in your sessionstore-backups folder. You can open your current Firefox settings (AKA Firefox profile) folder using either * "3-bar" menu button > "?" button > Troubleshooting Information * (menu bar) Help > Troubleshooting Information * type or paste about:support in the address bar and press Enter In the first table on the page, click the "Show Folder" button to launch the folder in Windows Explorer. Scroll down and double-click into the '''sessionstore-backups''' folder. Your open pages, as well as a number of previously visited pages in open and closed tabs, are saved in these files: * recovery.js: the windows and tabs in your currently live Firefox session (or, if Firefox crashed at the last shutdown and is still closed, your last session) * recovery.bak: a backup copy of recovery.js * previous.js: the windows and tabs in your last Firefox session * upgrade.js-''build_id'': the windows and tabs in the Firefox session that was live at the time of your last update Note: By default, Windows hides the .js extension. To ensure that you are looking at the files I mentioned, you may want to turn off that feature. This article has the steps: http://windows.microsoft.com/en-us/windows/show-hide-file-name-extensions ---- Firefox has a user preference which you cannot control from the server application which determines the extent to which the session history file will contain site cookies and form data in addition to the page's URL. You can experiment with this setting and issue recommendations or requirements accordingly: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button promising to be careful. (2) In the search box above the list, type or paste '''sess''' and pause while the list is filtered (3) Double-click the '''browser.sessionstore.privacy_level''' preference and enter the desired value: '''0''' => Save extra data for all sites '''1''' => Save extra data for HTTP sites but not HTTPS sites '''2''' => Do not save extra data for any sites ---- You might also look at the anti-caching options in this support article to see whether HTTP headers combined with using POST to ''load'' the form (not just to submit the form), bypasses saving form data: https://developer.mozilla.org/Firefox/Releases/1.5/Using_Firefox_1.5_caching