Doesn't work on 60.0b13 (64-bit), addon buttons do nothing.
I did restart the browser after install, and added the exception for the popup.
Also, the instructions on adding the exception are wrong, the page referenced by the addon author no loner exists, and probably for the very long time by now.

"Before leaving a shitty rating... maybe you're doing something wrong.."
Click Install
Restart Browser
Click SCDL button that is now on the tracks page
Nothing happens.
Right-Click the SCDL button
Nothing happens.

Firefox 53.0 didn't work, fake extension

That "GET ALL TRACKS" upper button... changed my life, thank you !!

It kind of works in a very clunky way, though has a really annoying, ugly orange banner at the top of the page with no option to switch it off. You click on a link and after a very long delay it pops up with a save dialog - often doesn't. There are better options that just add a download button that instantly starts a download.

Doesn't work. [Firefox Nightly]

kool app

The issues I have had with this is a MASSIVE IMPROVEMENT TO MY HAPPY HEART! Yes that’s right, I really like it.

May be improved but it works really well, I like it

This addon contains a coinhive bitcoin miner.

Grabs the metadata and artwork--amazing.

Ultimate way

I wish this add on would give you the option to select what audio format you want and also what bit rate. Some players don't always do well with just mp3.

Works just fine, the IDtagging is unique, but it doesn't bothers me. GJ :) the quality is only 128kbps though, but hey, it's fine

Hey Team,
I am having trouble getting it to download, I hit the link that pops up but it just stays as 'SCDL currently downloading 1', I have turned pop up blocker off so not sure what the next step is, any help would be unreal
Cheers

It is working great! Thank you!

Hey my brave developer!

Hate to tell you that SCDL 2.21 is not working on the newest Firefox update (57.0) either. The problem is still the same with deactivated adblocker(Adblocker Ultimate). But I apreciate the idea and it is not harming the system at all. That's what the three stars are for. xD
I can send you a screenshot of the closest I get to download a track. ;)

Just b.t.w:
It is the exact same problem since the first time I installed it, my friend(might be more than a year ago). So it is maybe your AddOn or it could also be your description, that leaves us alone with questions like "Where the hell is it even supposed to be downoaded to?"
or
"Will there be a download popUp or sth. like that?".
I think regarding the past you should think about some screenshots as a "Download-For-Dummies"-Tutorial, for example.
Enough joking:
I'm excited for the day on which I will read more than "SCDL currently downloading nothing" as its only true message. Whatever a message of succes might look like. ;)