The successor to a previous script I wrote that un-truncated links in YouTube video descriptions so I could copy and paste them into text files for archival purposes. This one is less suckish, and it adds a button that saves a text file containing various video metadata (video title, publishing date, author, URL, and description). The file takes on the same title of the video, and the anatomy of these files is as such:

VIDEO TITLE
PUBLISHING DATE
AUTHOR
URL

DESCRIPTION

I can confirm that this script works on Chrome (Tampermonkey) and Firefox (Greasemonkey) WITH THE NEW FLAT UI. I have not tested it with the classic UI, and I'd be damned if the script worked with it.

Note: These characters will not make it into the name of the text file: /\:*"<>?| - This is why the file contains the video title. I suspect this has to do with the library my script uses to save the text blob it generates to a file. Missing characters will be expressed as an underscore (_), and you can either replace them with the correct characters, or if your machine's file system doesn't support them, live with it.