Wii Shop Music for Amazon.com Port for Firefox от jhggygh

Literally just a port of the chrome extension (https://chrome.google.com/webstore/detail/wii-shop-music-for-amazon/pciclldagfdmnjlmdllohgpkhdkdcpga). I wanted this extension myself, but couldn't find one for Firefox.

Full credit goes to Austin, the original author.