You might need to silence Minecraft quickly without wanting to turn you PC speakers off, for example, when you're getting a zoom call. This mod adds a keybind to do that: pressing the key (by default F12, can be configured in Options/Controls) will set the Master Volume (from Options/Music and Sounds) to 0, pressing the key again restores the original value.
Optionally, you can auto-silence Minecraft when it loses focus, and restore the sound when Minecraft regains focus.
Also optionally, the mod can show a silence icon when it's active. The position and presence of that icon can be set in options.