The big threat here isn't the search results, which are basically useless and an annoyance, but rather the fact that the owner of that site could easily alter it to deliver much more devastating software. There's also the little problem that there's not a lot of information on this running around and that major AV packages (F-Secure and NOD32) don't see anything wrong with the file. Malwarebyte's Anti-Malware detects it as "Rootkit.Agent," though it doesn't seem to have any rootkit properties (no kernel hooks, for instance, at least not detectable by Rootkit Unhooker).
So, watch out for this file, and consider blocking the above address at your router. As I noted, it can drive-by install on a fully patched Firefox 2. Whether DEP can stop it, I don't know; the machine I found it on only supports software DEP, and it was in opt-in mode.
UPDATE: Firefox 3 is vulnerable to this as well. I don't believe Chrome is, however.