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Download Opera browser with:
Opera 44.0.2510.1449 don't play twitter videos, facebook, tumblr, etc, again.
Check here in *Nix subforum, there are some post with solutions for plugins/codec installation.
"You cannot know the meaning of your life until you are connected to the power that created you". · Shri Mataji Nirmala Devi
It will be necessary to wait for another update, to solve this problem that nobody understands because it happens from time to time.