EDIT 2022-06-16: While this add-on continues to work as described below, the website itself now seems to be broken. Clicking on any of the download links directs to the redditvideodl homepage without actually downloading anything.

As of 2022-05-28, I can confirm that this add-on works with both the old and new reddit layouts. It's not very sophisticated though, it essentially just adds a right-click context menu option for reddit links that opens a new tab to the developers website and appends the reddit URL. This could be replicated using a JavaScript bookmarklet.