Change the session store interval in Firefox

Mozilla Firefox has a feature called Session Store which restore all the previously open tabs and windows when your browser restarts in case of a crash. The sessions store interval is the time interval at which Firefox saves the open windows and tabs to the session store. The default value for the session store is 10 seconds (or 10000 milli-seconds), which means that Firefox saves all your Firefox windows and tabs every 10 seconds. You can change this interval if you want. Here is how :

1. Start Mozilla Firefox.
2. Type about:config in the location bar and press Enter.
3. Firefox will show a warning. Click on the button labeled I'll be careful I promise. to proceed.
4. In the Filter field type sessionstore. You would see a preference named browser.sessionstore.interval as show,
   
5. Double click on browser.sessionstore.interval to change its value. You can enter anything you want. The value is in milli-seconds. So if you want to enter an interval of 50 seconds, you will have to enter a value 50000, etc. If you enter a very small value, Firefox would consume a lot of the processor power saving open tabs to the session store — decreasing the peformance and making it slower. If you enter a very large value, then in case of a crash, your tabs might not get saved to the session store.
6. After changing the value, restart the browser for the changes to take effect.