Examine source code of Silenced Tab

{
  "manifest_version": 2,
  "name": "Silenced Tab",
  "version": "1.0",
  "description": "Presents a right-click menu option to open a link in a new muted tab.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Silenced Tab"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dbd9b2a8-f5fa-48df-b2df-c1bbfcbee080}"
    }
  }
}