It depends on your airport the dings vary throughout the day for each location. I rec'd one this morning.
What do you mean by ad blocker? Is that like a pop up blocker?
The ding is something that goes on your toolbar and when you get a new ding you will hear a sound and then there is a little envelope as well showing you have a new ding. Once you have a ding you double click on the ding logo and it will pop up the a web link with some text about when the ding expires. You double click on the link to bring up the list of fares. When the ding sounds nothing automatically pops up you have to do it manually.