I constantly have error F7701-1003 trying to play Netflix on Ubuntu 18.04 using FireFox 59.0.2.
I already googled the problem and tried following:
-enabled DRM in the settings, let FF download and install DRM software (widevine I suppose), restarted FF, even rebooting ubuntu completely
-not using VPN
-disabled all extensions
-disabled tracking protection
-not using private mode
-switching user agent data to mac/win and browser to chrome
Same machine on same network plays Netflix flawlessly on Windows 10 using FF as well.
31 Answer
Go into Preferences » Privacy & Security » History. If you have told Firefox to "Never remember history" then you will get the F7701-1003 error. Change it to "Use custom settings for history" and then make sure all four of the check-boxes that appear underneath it are unchecked. Netflix should now work.
Note: You probably don't need to have all four of those checkboxes unchecked. I suspect only the first two are essential. I haven't, however, bothered to test the theory. :)
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