Does Anyone Use Extensions with Mturk??

I use Turk Guru and it used to work all the time but now it only works if you are on the page. I used to be able to get other work done while it got hits but now I need to be staring at the Mturk screen. Did this happen for anyone else?
And now instead of "Start Turking" it says "Start main watcher"
What's going on? How can I fix it?