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Script code taken from userscript located at https://greasyfork.org/en/scripts/405614-youtube-polymer-engine-fixes (later: original script), wich violates original script's license. This script was removed from greasyfork.org (https://greasyfork.org/en/reports/10864) for the same reason.
Script contains code from https://greasyfork.org/en/scripts/405614-youtube-polymer-engine-fixes (lines 467-933 as if version 2.6.4), which violates source script license.
Script contains code from https://greasyfork.org/en/scripts/405614-youtube-polymer-engine-fixes, which violates original script license.