Bumping the thread as I am experiencing same issue with version 38, on linux mint raffaella, when attempting to watch some Netflix.
On https://html5test.com it looks like MPEG-4 ASP and H.264 aren't supported.
There is no built-in silverlight plugin (http://flashbuilder.eu/silverlight-plugin-version.html) nor any available download for linux.
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RE: Netflix and Twitter on OperaOpera for Linux