I used this to download a tune that did not have a download link. It worked fine. I like that there is an option to always ask me where to download it. I also like the option to not immediately start downloading after preparation. I suggest you put a link to your page in the "about this extension" section. I only saw the link buried in the options after I installed the addon. Many people may want more info before installing the addon, or want to learn more after installing the addon. I am talking about this page:
https://add0n.com/soundcloud-tools.html