If I choose another folder to save my downloaded files to, it repeats that folder twice. For example, I will choose my desktop and it will place the location as C:\Users\PC\Desktop\Desktop instead of just C:\Users\PC\Desktop. I tried disabling all add-ons and running it in safe mode, resetting all preferences, deleting the .perf file, reinstalling Firefox without saving preferences, yet I am still having the same problem.