This script adds a download button to the YouTube video player, making it even more convenient to download videos via 3D YouTube Downloader. No need to manually open the program and copy & paste links anymore.
Requires the installed version (i.e. non-portable version) of 3D YouTube Downloader, which is Windows-only. The best part of this software is that, if a resolution ≥ 1080P is selected, it automatically merges the video and the audio parts for you.
UPDATE: Now you can go even faster! Simply right-click the button and that's same as click "Download"!