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Netflix needs me to constantly restart Firefox

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I recently upgraded to the latest version of Firefox. Ever since when I try to watch videos at netflix, I get the following behavior:

The first time after I start Firefox it works. But then when I quit that movie and go to restart it or view a new movie I get the following error message: 

"Thanks for installing

Once installation is complete please restart your browser to watch this movie."

If I restart Firefox I can watch the movie the first time but once I quit and try to continue that movie later or watch a different one I get the same error message. Essentially every time I want to use Nettflic VOD I have to restart Firefox.

I've also just started using Script Blocker but I have script blocker disabled for Netflix (the S at the bottom corner has no slash through it). Also, I was using Script blocker for several days with the previous version of Firefox and Netflix worked fine, it was only after the automatic upgrade a couple days ago that I started getting this problem.

Also, Netflix works fine in Safari, don't have this problem.