In my opinion, Paperpile is the best reference manager - it is fast and updated regularly with new features.

Works perfectly! Just like on Chrome. I can easily and quickly import references and PDFs into my library and assign references to specific folders all from within the extension. Thank you for supporting Firefox!

I installed it a few days ago and so far it seems to work fine as it does on Google Chrome. It is a great tool for my literature management.

This used to work and it was great. It looks like they've canceled support.