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cant watch xfinity getting error msg 560

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When I try and watch xfinity videos on Comcast I get an error msg asking me to refresh my browser. I can view them using IE but not with Mozilla as my browser.

When I try and watch xfinity videos on Comcast I get an error msg asking me to refresh my browser. I can view them using IE but not with Mozilla as my browser.

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You are using an outdated version of Firefox, upgrade your browser and try