what is the issue between VLC and Firefox in ubuntu 12.04?

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http://askubuntu.com – In ubuntu with the XFCE interface when I have VLC loaded and attempt to load Firefox the video freezs and loops for almost a minute. I have a 64 bit AMD with 2 gb of ram. I am also running a nvidia graphics card with 128 mb of ram. I have never had this issue until I updated to 12.04. Any ideas? I thought it might be a problem with the video driver and the flsh plugin maybe? (HowTos)