This extension is a simple volume mixer that allows the user to change the volume of individual tabs as well as the master volume of all tabs from a simple popup UI in the right hand corner of the screen. To use, just click on the mixer icon, and select which volume level you wish to set for each tab.
Note: This extension currently works only with HTML video and audio elements (does not work with Flash). It might be necessary to use another extension to force websites to use HTML5.
If you find any bugs, or have any feedback in general about this app, email firstname.lastname@example.org and I will try to help you with any issues.