5Sep/0919
How to fix the video lag in Firefox!
Lately my video (HD) playbacks in YouTube seemed to be lagging a LOT! I wondered why. I thought it would be me and my years old OS or perhaps even somehow my pc.
But no it wasn't. The lag was caused by Firefox's session saving feature. A simple and fast change in it and "poof" went the lag.
- Open Firefox and type in "about:config" (without the ") in the Address Bar and hit Enter.
- Type in "session" in the "Filter" line at the top of the list.
- Find “browser.sessionstore.interval” and double click it. The 10000 milliseconds (equals 10 seconds) is the interval in which Firefox keeps saving your session in case of a crash; same amount of time between video lags.
- Change it to something different. 120000 equals 2 minutes, 300000 equals 5 minutes or something else you desire. I went with 600000 (10 minutes), because I don’t particularly care about session saving.
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April 26th, 2012 - 01:29
Dude you’re the best! Thanks, was an instant fix!
March 21st, 2012 - 22:03
Man that did it! Instantly! I am impressed. Thanks!
December 17th, 2011 - 20:48
Fixed mine too. Took 2 seconds to make the change too. Highly recommend this.
December 10th, 2011 - 12:04
thank you so much it solved my problem on firefox 8.0.1
October 4th, 2011 - 23:01
Thank you so much i`v had to deal with that crap for almost 2 years.But as soon as i did as you told.It stop lagging 100 percent thank you so much.
September 5th, 2011 - 20:19
hi, i have just done the above and set it to the same number as you did, when i watched films before it would usually be alright for about 20 mins at a time but then lag constantly with no gaps. and then i would have to close the video down and put it back on and fast forward it to the spot that i was on for another 20 mins
so now hopefully it will have sorted it out now 
thanks.
May 21st, 2011 - 08:13
thx alot it solved my problem on firefox 4.0.1