Tumblr Volume Slider
Adds a global volume slider that updates the volume of all video and audio HTML elements on the page.
What is Tumblr Volume Slider?
"Tumblr Volume Slider" is a Firefox add-on that allows you to easily control the volume of all video and audio elements on Tumblr blogs using a global volume slider. This add-on automatically sets the volume to 50% on page load.
This only affects the default layout of blogs.
All sources use the same volume bar for control. Volume is set automatically to 50% on page load.
Tumblr Volume Slider may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Tumblr Volume Slider is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.