google which owns youtube and developed the chrome browser does not allow you to download youtube videos. its against their terms of service Section 5b
im sure they prohibit the development of any plugin that would allow you to do this with their browser
Quote:Content is provided to you AS IS. You may access Content for your information and personal use solely as intended through the provided functionality of the Service and as permitted under these Terms of Service. You shall not download any Content unless you see a “download” or similar link displayed by YouTube on the Service for that Content. You shall not copy, reproduce, make available online or electronically transmit, publish, adapt, distribute, transmit, broadcast, display, sell, license, or otherwise exploit any Content for any other purposes without the prior written consent of YouTube or the respective licensors of the Content. YouTube and its licensors reserve all rights not expressly granted in and to the Service and the Content.
im sure they prohibit the development of any plugin that would allow you to do this with their browser
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