@FrustratedChat, there's been a bit of a change to the UI in the past few weeks.
The chat pop up should appear as per the screen cap below. For the best experience, we suggest browsing on Chrome. Depending on the speed of your connection & computer, there can be a slight lag. I've given it a test and it's working fine on our end.
It was explained to me, I can't remember the name given to this sort of functionality, but it's not a pop up in the traditional sense.
You'll notice the chat bubble on the bottom right of your screen. It moves along with your cursor. You can open and collapse chat as you please. Once it's open, you can drag and drop the icon anywhere on your screen.
For example, if the Live Chat agent directs you to the offers page, you can navigate to that page without the need to switch tabs. See below: