I can get sound for files ON my laptop but have no sound when I try to watch Hulu or use other web-based programs

My MacBook Pro has sound for files housed on my laptop (ITunes for example) but if I try to watch a web-based program like Hulu or Khan Academy there is no sound. How can I fix this? I was using wireless headphones a few days ago and it all worked fine but then the sound stopped on both the headphones and the computer. The video portion works fine, I just don't have any sound. I threw away the headphones and deleted them from the Bluetooth on the Macbook Pro but still I have no sound. Any ideas?

1. System Preferences > Other/ Flash Player > Advanced > Delete All
     Press the "Delete All" button
2. Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
   Download it first.
   The next step is important.
   Click Safari in the menubar and select “Quit Safari”.
    Follow the prompts and install it.
    Restart computer. Relaunch Safari.
2. Allow Plug-ins
    Safari > Preferences > Security
    Internet Plug-ins > "Allow plug-ins"
    Enable it.

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I can get sound for files ON my laptop but have no sound when I try to watch Hulu or use other web-based programs

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