Does exactly what I want. However, I find myself wanting MORE!

If I could add something: Hotkeys shortcuts to jump to certain volumes, ex. NumPad5 -> Jump to 500% Volume. PgUp -> +100%, PgDown -> -100%.

I also notice if I set the volume in the tab to 600% (or anything) and there are multiple videos, or the video hasn't started playing, the volume changes will not take effect until I start the video and THEN change the volume. I find myself having to set the volume multiple times on a single webpage due to this. Maybe a "set default volume for this tab" or something like that could be useful.

Thanks!