Pressing "CTRL+SHIFT+D" opens the current YouTube video in y2mate, allowing you to download.
A y2mate Violentmonkey script.

Press "CTRL + SHIFT + D" on a YouTube video page to download it.
Step 1. Install Violentmonkey
Step 2. Click the button below.

Please note that "y2monkey" is not affiliated, associated, endorsed, or sponsored by y2mate.com or Violentmonkey.