Short answer? Yes. One way is with an add-on to firefox called sqlite manager. But is this really what you want to do? A full scan might wipe out the changes you have made, and deleting the database, (often done to solve problems), and doing a rescan certainly will. Maybe you really want to change the metadata in the music directly?
This is what I originally wanted to do but I couldn’t figure out how to do it. I normally edit the the metadata for the music in my music player but I am not able to edit the files from the Firefly share. Any suggestions on how to do it?