This is certainly not due to developer.yahoo.com, Technically its not possible for a site to redirect it to its own site. This typically happens due to some virus or malware on your computer.
How To Solve This ?
Your computer might be infected by some virus or malware. You should clean you computer. Try using solution from Norton or McAfee.
If you have solved this on your own, please update the solution bellow. This forum thread is right place to help people having the same problem.
in General Discussion at YDN