Very few features on our site use pop-up windows.
We have kept this to a minimum since some web browsers and Internet service providers offer the option to 'block' pop-up windows to help block annoying advertising. Popup windows are also a nuisance on mobile devices. You may experience your browser opening a new tab, for instance if you are downloading data from your account. This is normal, and should not be blocked by your popup blocker.
There are features on our site that use 'modal windows' - screens that pop information in front of the current screen. But technically you are still on the same web page, so these should not be a problem. Examples of modal windows are clicking a smaller image to view it larger and some of our text editing tools.