[ubuntu] FireFox freez at 20s ??

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http://ubuntuforums.org – Hi guys. Not sure if this is an ubuntu problem and I can post this up here. Guide me to the right place if it must be at some other places please. I am using ubuntu 13.04 with mozilla firefox as the web browser (default version on ubuntu 13.04). I have noticed that firefox stop streaming some media content around 15 to 20s (that is AFTER PLAYING THE ADD) but keep saying “buffering” but would never play it again. I had this issue with previous versions of ubuntu but google chrome browser was spared but seems its chromium browsers (installed from repo. not the google chrome) is affected (Hardware)