I tried both, and both weren't working. Also, when I tested it locally, I made sure that it had a page to go back to.
It's fixed now. I used the browser action go to URL, and used 'go to "/" (target self)' as a designation, so it always goes back to the webpage, even when the game changes websites or something.
Not sure if this is the proper way to go at this, but at least it's doing what I want now.