I love Firefox, but there are always minor issues with any piece of software that should to be addressed to make them run even better.  Here’s one that has bothered me for quite some time.  If Firefox has been running for a while and I have a bunch of tabs open Flash performance, especially video, tends to suffer.  It turns out there’s a simple fix.

If you’re watching video on Firefox and it seems to skip or stutter every ten seconds or so it’s because Firefox is taking a snapshot of all your open tabs in case your browser crashes.  You can either disable the session restore feature (not really recommended) or you can just change the interval from every ten seconds to something a little more reasonable.

To do so simply type about:config in your address bar, then type browser.sessionstore.interval in the filter box.  It’s default value is 10000 (10 seconds in milliseconds) so just change this to something like  60000 for 1 minute intervals 120000 for 2 minute, etc.  You don’t even have to restart Firefox for this to take effect.

I made this change earlier today and I cannot believe the difference.  Even after having Firefox open all day and dozens of tabs open youtube videos play totally smoothly.

Found via Lifehacker