Browser.sessionstore.max tab back history
From MozillaZine Knowledge Base
Firefox 2 introduced a built-in Session Restore feature, allowing the user to continue browsing from where they left off if browser restarts. However, during Firefox 3 development, it was discovered that the feature negatively affected page load times. To address this, a limit was established for how many previous session history entries were kept for each saved tab. This preference set that limit.
Eventually it was determined that limiting session history entries for saved tabs did not significantly improve performance, and the code performing the limiting was backed out.
Possible values and their effects
A positive integer, indicating how many previous session history entries are kept per tab when saving a browser session. Default value is 10.
First checked in
Has an effect in