Tabs/windows that are closed a long time before, set in _closed_after (target for Firefox 32).Pages loaded after, that are more then set in _serialize_forward (since Firefox 30).Pages loaded before, that are more then set in _serialize_back (since Firefox 30).Form data (for the case of a browser or system crash).Loaded pages before and after (back and forward buttons).Closed windows and tabs (closed tabs, tabs in closed windows, closed tabs in closed windows).This page is about documenting things progressively. For this reason, it is undergoing major refactorings and redesigns. It was designed a long time ago, when users only had a few tabs, when DOM Storage didn't exist and before people started uploading Gigabytes of data. This service is extremely useful but is also quite expensive. Session Restore is the service that saves the state of Firefox while the user is browsing so as to be able to restore it after a shutdown or a crash. 6.5 Forgetting closed tabs/windows when Firefox closes normal.

6.4 Forgetting closed tabs/windows after a time.

5.2.5 Binary format that can be loaded/modified piecewise.

5.2.4 Save separately index (one file), tabs (one file per tab).

5.2.3 Journalize files, consolidate them on idle-daily and shutdown.

2.4 Data we forget on a manual close of the browser.

1 What is Session Restore, why this page?.

Restore session firefox manually