Something that really bothers me about the DDG interface is how it hijacks the up/down arrow keys I use for scrolling. After searching, press down, and the page won't scroll down, it'll just highlight the first search result. Keep pressing down, and the page still won't scroll until the last visible result is highlighted. Press down one more time, and the page scrolls erratically, highlighting the next result in the center of the window. At this point, pressing up/down will scroll exactly as far as needed to keep the prev/next result highlighted in the center.

I find this very annoying. After years (decades!) of training, my eyes know exactly how far one keypress should scroll. Stop messing with the default scrolling mechanism!