Prompt to Overwrite Existing File

[numeralnathan]

I sometimes download the same video twice by mistake. The Firefox plugin simply downloads the video again but adds "-1" to the file name. Please prompt the user if they want to overwrite the existing file. Please show the user what the existing file size is and the file size of the downloaded file. The user can then decide to overwrite the existing file, make a "-1" copy, or skip the download.