Fix Video Lag In Firefox

August 24th, 2009 Leave a comment Go to comments

There’s a weird bug in Firefox that when watching videos on YouTube or Hulu you will see a little video lag every 10 seconds or so… and luckily someone figured out how to fix it.

The fix was presented quite some time ago actually but I only just came across it and it has made watching online video so much more pleasant – and it’s an easy fix.

  1. Open Firefox and in the Location/Address Bar type in about:config and hit Enter.
  2. You are now looking at some of the advanced functions that can be customized.
  3. In the “Filter” line at the top of the list (where your cursor should already be blinking) type in session and it will automatically reduce the listings.
  4. Now find “browser.sessionstore.interval” and double click it.
    That number is how many milliseconds between the times that Firefox saves your current browsing session in case of a crash and 10000 milliseconds equals 10 seconds – the same amount of time between video freezes.
  5. Change that number to something different. 300000 is 5 minutes and 120000 is 2 minutes. I actually switched mine to 600000, which is 10 minutes, because I don’t worry about session saving much.

That’s it. You should now have much smoother video playback at YouTube.

UPDATE: With HTML5 being used at YouTube and Vimeo now, it would be beneficial to switch to an HTML5 compatible browser such as Chrome and Safari (at the time of this writing). Firefox will be supported on those sites soon as well.

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  1. August 24th, 2009 at 12:42 | #1

    Where you trying to figure out why youtube videos kept buffering on your 20mbit connection too?

  2. August 24th, 2009 at 13:57 | #2

    Nah… I ran across it in an OS X help forum about a different problem and was very happy it was found. Evidently it’s been reported as a bug and they are working on a way to change the session saver function when video is playing.

  3. Jerbones
    August 24th, 2009 at 17:58 | #3

    remember in the movie “Hackers”…they are looking at Angelina Jolie’s Characters laptop…and one dude says “IT HAS A 28.8 BPS MODEM!!!”

    Oh man…those were horrible days for porn…thank you satan for broadband <3

    Your comments just made that pop into my mind…isnt that weird…?

  4. December 3rd, 2009 at 18:12 | #4

    Thanks, this worked perfectly! I appreciate it.

  5. Konrad
    February 3rd, 2010 at 19:54 | #5

    Dude… AWESOME. Thanks so much for this info… the issue was driving me nuts.

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