Chrome: The transparent popup-style overlays that sites occasionally use to block content and require you to wait for an ad to play, sign up for a newsletter, or just agree to some weird terms are obnoxious. BehindTheOverlay is an extension that gets rid of them.
BehindTheOverlay works similarly to a product like AdBlock, but it doesn't need the same horsepower to run. Its only real purpose is to hide those overlays, which it does pretty well on sites like Quora, The Financial Times and others. As you'd expect, it doesn't work all the time for every single overlay since they're not always coded in the same way, but it does its job a good amount of time.