Browser.sessionstore.max tab back history

Background

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

2007-01-09 by Dietrich Ayala

Has an effect in

• Mozilla Firefox (nightly builds between 2007-01-09 and 2008-03-17)

Related bugs

• Bug 398807 - session restore accounts for 2-3% of talos pageload (make it faster)

Related preferences

• browser.sessionstore.enabled
• browser.sessionstore.interval
• browser.sessionstore.max_tabs_undo
• browser.sessionstore.postdata
• browser.sessionstore.privacy_level
• browser.sessionstore.resume_from_crash
• browser.sessionstore.resume_session_once

External links

• Session Restore PSA (Dietrich Ayala’s blog)