Well my problem is exactly the same as in this post: https://support.mozilla.org/en-US/questions/1256699 My Firefox and my Widevine are both on the newest versions, I have this problem only with Firefox and its been that way for a while now, but it got too annoying so I'm posting about it now. The errorcode is also the same is in the other post (F7703 - 1290). This error also isn't findable on the official Netflix help side. It only affects Firefox refreshing the page or coming back a month later it doesn't matter it never works in Firefox anymore it used to work. In any other browser or in the app it always works. I also tried to disable all my addons and it didn't help. I hope it will be fixed someday, bye.