Vimm's Lair is a preservation project targeting old console videogames. As of June 6th 2024, many games were removed. I am a firm believer of preservation and public archive projects and hate to see active attempts to prevent such preservation.
This (Unofficial) Chromium Browser Extension provides a solution for those who still want to retrieve the ROMs. The N stands for Nintendo, you can guess the rest.
git clone https://github.com/Primitheus/vimmslair-fn.git
Enable Developer Mode in the Extensions settings.
Use the Load unpacked button in the Extensions settings and select the vimmslair-fn folder.
Find a ROM that does not download and has the online emulation feature. Click "Play online" on the webpage. Open the Extension, and if a game is found it should show the name of the game. Click "Download" inside the Extension.
I have absolutely no affiliation or contact with anyone from Vimm's Lair. This tool is unofficial. I do not condone or support Piracy and this tool does not aid in acts of Piracy.