The extension is a great idea and adds a lot of very useful features that work perfect. However, the extension constantly makes annoying popup windows begging the user to check out new features of the extension, show ads, or update their browser. This is highly disruptive and abusive and is unacceptable.

Uninstalled. I discovered and installed Enhancer For Youtube instead, which has all the same features and more, without being a spammy piece of malware.