You can still view YouTube fine if you change the user agent to Firefox 43 32 Bit GNU/Linux using e.g. user agent switcher add-on and use an older version of ViewTube which can be downloaded from here:
https://raw.githubusercontent.com/sebaro/ViewTube/531c2224b05fc92bef6dd9e1a4a2f0d03da8bbcd/viewtube.user.js

(This hack will probably cease to work as Google constantly updated the YouTube interface.)

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