I'm no computer expert, but everytime I see doubleclick in any of its myriad forms, I add it to security blacklist. There is also one of the most highly recommended add-ons that enables you to do this. Presumably, either it doesn't block your entry, or you find out more about the problem - as I would interpret it, your are being routed through a cookie.

Purely a logic estimate of issue. No expertise.

Look in your extensions and see if you have xulrunner 1.9.1 "enabled". If so, try disabling it. This worked for me today. The redirecting stopped immediately. I can't find any way to "uninstall" xulrunner 1.9.1 so I am being careful to make sure it remains "disabled". I also found my "Hosts" file in system32/drivers/etc folder had been changed so I edited it and removed all references after "127.0.0.1 localhost " but I really don't think this was part of the problem. It was mentioned in other threads "Google redirects" so i gave it a try.

In my case, the key to eliminating the XUL Runner 1.9.1 was in finding the registry entry:

HKEY_USERS\S-1-5-21-4084633196-3991238857-972333920-1000/software/mozilla/firefox/chrome. The “chrome” folder contained two files and a sub-folder named “content”. The Chrome folder contained the files “chrome manifest” and “install.rdf”. The content sub-folder contained the files “cfg.js” and “overlay.rdf”.

I found this path thanks to another poster here who tipped me off to the fact that the problem might be being caused by a Firefox extension. Then I was able to stop the problem by selectively disabling my extensions one by one till I found the one causing the redirections. I still wanted to uninstall the extension.

Finding the registry path was strictly hit-or-miss because I didn’t know the name of the files I was looking for. If someone else comes up with this problem, I’d suggest searching the registry for “cfg.js” and/or “overlay.rdf”. This should reveal the registry entry and enable them to eliminate it. Before I deleted the registry key, I took the precaution of saving the files and registry entries in a newly created file in My Documents in case whoever wrote this crap found a way to disable my computer if they were missing from the location where he stuck them.