I'll look and see - obviously I installed it some time ago...
ETA: I found this instruction, but I'm having trouble opening the home page for this link:
Code:
This is from GitHub:
https://github.com/psyrendust/dedrm-ebook-tools/blob/master/Other_Tools/B_and_N_Download_Helper/BN-Dload.user_ReadMe.txt
Go to http://userscripts.org/scripts/source/152985.user.js
The name of the script shows as I'd listed it in the Add-ons listing, but apparently the filename is actually 152985.user.js. I found that file on my computer. If you're interested, I could save it as a text file and PM it. I don't know if I'd be allowed to post the actual code here (willing to do so, if it's okay).
ETA-2: I found a comment on the Greasemonkey page that the userscripts.org site is defunct.