This extension can be used to control YouTube Music from the toolbar area of your browser without activating its tab. The extension allows you to pause, play, resume, seek, change volume, mark as liked and disliked right from the toolbar popup. The idea is to use the YouTube Music without the need to activate the tab to perform the basic commands.
Notes: this extension only offers controls. In another word, the tab is the actual player. You can only control YouTube Music from the popup. Hence you need to have an open tab for the extension to operate