Firefox is by default saving the active session every ten seconds. This is handy if the browser crashes to avoid data loss. I was more than once happy that Firefox provided the session restore functionality to avoid loosing part of the article that I had written during that session. Some users might need to change the interval that is used to save the active session either because they want to make sure that the active sessions is stored more often to reduce the data loss further or to extend the interval to free up some resources that are used by this feature.
The parameter can be found in the Firefox configuration that is available by typing about:config in the address bar (also known as location bar and awesome bar). The name of the parameter should be entered into the Filter field so that only this parameter is shown in the configuration to avoid mistakes.
Filter for browser.sessionstore.interval to find the parameter. The interval is specified in milliseconds. To reduce it simply enter a smaller value, 5000 would mean that the active session is stored every 5 seconds instead of 10. If you want to increase the value you could add 30000 for 30 seconds or 60000 for 60 seconds.
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Martin are you able to make use of the Firefox’s session restore feature? In the startup options if i choose “load my windows and tabs from last time”, i don’t get those when i load Firefox next time. Do you also experience the same?