Control YouTube video volume by mouse wheel.
当前为
Use mouse to control YouTube video volume.
Homepage: https://github.com/wdwind/YouTubeVolumeMouseController
V 1.3.0
Use MutationObserver to cover all corner cases.
V 1.2.0
Big refactoring and multiple issues fixed.
V 1.1.0
Fixed the problem that the script not working when navigated from homepage
