This addon's "Homepage" points to a deprecated GitHub repository, whose description tells you to go to the repo "LibreScore/dl-librescore" instead.

There you can see the various ways to download musescore scores. A convenient browser extension like this one is NOT one of them. The closest thing is to download the Tampermonkey extension and then download the musescore downloader script as described in the link.

Used to work well but not anymore. A huge thanks to Dars below for submitting a workaround with good instructions that works well with tampermonkey!

This extension doesn't work anymore ... BUT for a working alternative: 1 Download the extension 'Tampermonkey' which allows you to run scripts. 2 Google 'LibreScore' and visit the Github website. 3 Press on the pinned 'dl-librescore' link. 4 Install the latest dl-librescore file. 5 PROFIT. You can now download PDFs, MP3, and MIDIs from Musescore.

Borked :-(

Cannot download as PDF, errors get redirected to joining their discord server

Doesn't work, even with authorization.