After updating, opens a tab of the website SMACK in your face. Doesn't matter if you're on Netflix on the TV, full screen, the add on decides that you have to be looking at their tab RIGHT NOW and BAMM, opens and switches the focus to it.

Because of that, it has to go. There are a lot of ways to display your release notes (such as display them within the UI of your extension) than force-opening a website.