I'm not sure if this is a bug or a feature, but the banner ad reloads and changes into a new ad whenever the window resizes. I'm using Firefox 33.1 and I frequently press the alt button for voice communication, this opens up the menu bar and resizes the window, causing the ad to reload, which can be somewhat annoying if you're looking at or want to click the ad. This also happens if you simply resize the window.

This happens because the ads are responsive in nature.. you get small ads if the browser shrinks down.

The ads are very much the same size when I press alt or don't have my window maximized, I do get smaller adds if I make my window small enough, but shouldn't a new add be loaded only if you cross that threshold?