Are you expecting something to pop up? Because I expected that and thought that the script wasn't working, but I scrolled down to the bottom of the page and there it was at the very bottom asking me if I wanted to use the bets from that page. It may be doing that instead of doing a pop up for some reason. Unless you've scrolled all the way down the betting page and nothing was there.
Thanks so much for mentioning that, I never would've even noticed it! I was expecting a pop up yes. That does come up at the bottom of the page when I use the script on firefox I'm so glad I can finally start using it now!