I tried searching for something in Chrome a few minutes ago and found that my search was being handled by something sinisterly named Facemoods. Aghast, a few more checks confirmed that I had a toolbar installed on my system of the same name, the Chrome search engine was set to Facemoods by default and that I had an extension installed as well. A little more digging revealed that all this was jDownloader's fault as it installs the toolbar during its own installation process. Not good.
Removing all this junk involves the following steps: