Examine source code of Tab S Controller

{
  "manifest_version": 2,
  "name": "Tab Sound Controller",
  "version": "1.0.0",
  "description": "Control tab sounds: list, mute, and unmute tabs easily.",
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_title": "Tab Sound Controller",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-sound-controller-addon@example.com",
      "strict_min_version": "78.0"
    }
  }
}