When I open Firefox, a download file prompt appears for a file that I previously downloaded. I'm using Windows 8 x64 on a brand new laptop. (Not the computer I'm posting from) I've tried the following: Set Firefox to use the default homepage. There are no secondary pages. Set the default homepage back to default. (The default homepage does come up) Tried launching Firefox directly from c:\program files (x86)\mozilla\Firefox. Clearing the downloads list. Deleting all files in the Downloads folder. Searching the HKLM\software\mozilla registry key for the filename. Searching the about:config section for the filename. Deleting the app data folder from app data\local.