
To get started follow steps below
Step 1: Launch Mozilla Firefox
Step 2: Enter about:config in the address bar and press Enter on your keyboard
Step 3: Click I’ll be careful, I promise!.

Step 4: In the Filter field, type the command browser.sessionstore.interval.

Step 5: Double click on the option browser.sessionstore.interval from the results
Step 6: Change the value in ms, 15000 (15 seconds) by 5000 (5 seconds) then click the OK button to save changes

Step 7: Now restart your Firefox for changes take effect.
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