netflix - plugin widewine Cdm has failed

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Hey friends, I have fedora 26 and firefox 60.

I am totally new in fedora and im learning, so please give me a little help.

Netflix doesn't play and it tell me that plugin widewine Cdm has failed and Error Code: F7702-1003

At the start, my firefox would't play videos in facebook, vimeo, twitter and youtube. I managed to fix it and now they all play, but netflix seems a big issue.

What can I do?