acceptDanger() function of the
downloads API prompts the user to either accept or cancel a potentially dangerous download.
This function can't be called from background scripts, only in scripts that are running in a visible window (such as a browser or page action's popup).
This is an asynchronous function that returns a
let prompting = browser.downloads.acceptDanger( downloadId // integer )
Promise. When the dialog closes, the promise will be fulfilled with no arguments.
BCD tables only load in the browser
Note: This API is based on Chromium's