Allow to control the volume of the player

[martin31821]

First of all, great extension.

I have a suggestion, it would be cool to be able to control the volume of the youtube player using the extension. I think about hovering the button and then control the volume using the mousewheel just as in the original youtube player.

[maroun-baydoun]

@martin31821 Thank you for the feedback. It's certainly a good feature to have.