I\'m developping a Google Chrome extension, using content script. I want to interact with pages embedding a YouTube video player. I have include the www-widgetapi-vflj
I was using YouTube player API before and it was working properly. Today I have issues like you, and I did not change anything in my code. It might mean that the www-widgetapi-vfljlXsRD.js has been changed and encounters bugs... I cannot help any further.