Global Mute

Function to mute/unmute the audio from the whole application

like a button on the toolbar and a menu item that mutes all audio coming from the application, not just individual tabs

Hey! Are there currently any other browsers that offer this feature on macOS and/or iOS? What is their UI for this like?

laiz i think this could be put here in Orion for iOS

I don't think it's Orion's role to block all the audio coming from it. However, blocking audio from a single tab would be more appropriate.