Added a unsafeWindow variable check to check if a YouTube player listener is set by YouTube and then removes it if so.
Added a unsafeWindow variable check to check if a YouTube player listener is set by YouTube and then removes it if so.

YePpHa/YouTubeCenter,YePpHa/YouTubeCenter,YePpHa/YouTubeCenter,YePpHa/YouTubeCenter,YePpHa/YouTubeCenter