"X (Twitter) Show Volume Controller" is a free Chrome add-on developed by shirakaba. It falls under the category of Browsers and is specifically classified as an Add-ons & Tools subcategory.

This add-on addresses the issue faced by users on Twitter where hovering the mouse over the volume icon does not display the slider to adjust the volume. With "X (Twitter) Show Volume Controller," you can now easily control the volume of Twitter videos by forcing a volume controller to appear, similar to the functionality found on other video platforms.

By installing this add-on, users can enhance their Twitter video viewing experience by having the ability to adjust the volume directly within the Twitter interface. This simple yet effective solution eliminates the frustration of not being able to use the volume control feature, as reported by users on platforms like Reddit.