Netflix plays in Firefox Nightly but not 54.0.1
macOS 10.12.6 Firefox 54.0.1 Firefox Nightly 56.0a1
Playing Netflix in Firefox Nightly works fine. Attempting to play Netflix in 54.0.1 results in this error: https://help.netflix.com/en/node/32660 Problem began after installing Firefox Nightly.
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You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").
Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks and history and cookies and passwords and cache and exceptions, so be cautious. If you have a password or other data from that domain that you do not want to lose then make sure to backup this data or make a note.
You can't recover from this 'forget' unless you have a backup of involved files.
If you revisit a 'forgotten' website then data from that website will be saved once again.
Maybe also check that you do not run Firefox in Private Browsing mode (never remember history).
Thank you for the reply, but this did not resolve the issue. The error continues in Firefox 54.0.1, but does not occur in Nightly.