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i get 'opening rpc.html from http://xfinitytv.comcast.net that says its a firefox doc

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packattack
packattack
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every time I open comcast or any page, I get a pop up that says 'opening rpc.html. The text says I have chosen to open rpc.html which is a: Firefox Document from:http://xfinitytx.comcast.net Then it asks 'What should Firefox do with this file? I don't subscribe to xfinity although I use Comcast as my provider. How do I stop this pop up?

every time I open comcast or any page, I get a pop up that says 'opening rpc.html. The text says I have chosen to open rpc.html which is a: Firefox Document from:http://xfinitytx.comcast.net Then it asks 'What should Firefox do with this file? I don't subscribe to xfinity although I use Comcast as my provider. How do I stop this pop up?

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John99
John99
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A quick web search suggests this may be a comcast problem see this comment from a comcast forum mod: