1. Type about:config in the address bar and press Enter
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2. Use the filter box to find the setting browser.sessionstore.interval
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3. Edit the default value 10000 (10 seconds in million seconds) to 180000 which is 3 min.
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How does the tweak work?
Firefox takes snapshots of your browser every 10 sec to restore if Firefox crashes, but slows flash too, so this is a slight compromise for fast videos.
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