One quick question - I have the other YouTubeizer extension installed....do I have to uninstall it before using the new add-on extension? can they both be installed as extensions....one if you use the HTML editor and the other if you don't?

Hello Mike,

The YouTubizer add-on is an add-on for the Advanced HTML Editor 3, so it can't be used as a standalone extension like YouTubizer. There is absolutely no problem to have them both installed, as they are used for different purposes.

seems cool!