Google Music is a service which allows you to upload your personal music collection and access it instantly on the web or any compatible device without the hassle of wires or syncing. Google Music Downloader is a new Firefox add-on which allows you to download any song from Google Music. You can simply right click on any playing song and select Download song option from the Firefox context menu.
There is also live monitoring option available which means, the add-on will automatically notify you of any Google music songs available for download.
With Google Music Downloader, you will be able to download songs just by right-clicking them. The extension does not require any restarting of Firefox after installation.