Footnote:
This tutorial is only a minor replacement for the YouTube player. You can still use these extensions, which have more features.
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[FREE] 360 Viewer with Youtube and Facebook 360 Videos Support
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(some more extensions, I forgot them, search the extensions directory!) EDIT: actually,I don't think there are more similar extensions.
Of course, if you can, you should still use the method without extensions. Read Extensions vs build-in Blocks.