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https://xtv.comcast.net/ will not load on Firefox 43.0.4

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https://xtv.comcast.net/ will not load on Firefox 43.0.4

In the past I viewed DVR content on https://xtv.comcast.net/ using my Win 8.1 laptop and Firefox 43.0 without problems.  For the past several weeks the process gets hung up at "Preparing your channel lineup" and never advances beyond that.  Fortunately I am able to jump over to Chrome 47.0 and it works without problems.  I do not recall upgrading or changing settings on Firefox. What must I install or reconfigure to make Firefox work again?

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