This extension is very useful for me. I use it regularly, and for several years now.

We have to click on an audio file to activate the recognition of it (that's the same behavior for Video DownloadHelper, for example), and then we can see the file(s) in the Audio Downloader Prime window (and the colorization of the button).
In the addon window are displayed the filesize and the bitrate, which are very useful informations for me (Video DownloadHelper doens't display such important informations..)
And then it's easy to download the files you want.
Moreover, the file names are usually better displayed (the right titles, and with spaces) than with other download addons.

The only little bug I know about this extension is when the addon has discovered numerous audio files (usually more than 10), then the addon doesn't recognize new audio files anymore, and I have to clear the list of audio files in the addon window and to reload the webpage to be able to see the new audio files. Knowing how to solve this little problem, it's not that annoying.

Note: It works fine on all webpages where audio files are entirely and silply embedded.
It doesn't work on some streaming platforms, cause the files are hashed with some protocols. You'll have to use other tools for that.