If popups open rapidly or you open to many windows inside the ps3's internet browser, it will slow down the speed of the internet browser and can make it crash and freeze up, as it causes the ram to get clogged up. So it is ideal to close the windows in the ps3's internet browser that you don't need.
1)When you are in the ps3's internet browser, press in the left analog stick on the ps3 controller.
2)Then highlight the window you want to close down in the internet browser, with the left analog stick.
3)On the ps3 controller press down the "Triangle" button and select "Close Window".
4)The window in the ps3's internet browser you chose to close will now be closed.