Examine source code of TTV for Sidebar

{
  "manifest_version": 2,
  "name": "TTV for Sidebar",
  "version": "1.1.0",
  "description": "View your followed Twitch channels with live/offline status.",
  "sidebar_action": {
    "default_title": "TTV for Sidebar",
    "default_panel": "index.html",
    "default_icon": "ttvfs.png"
  },
  "icons": {
    "16": "ttvfs16.png",
    "32": "ttvfs32.png",
    "48": "ttvfs48.png",
    "128": "ttvfs128.png"
  },
  "permissions": [
    "identity",
    "storage",
    "https://id.twitch.tv/*",
    "https://api.twitch.tv/*"
  ],
  "applications": {
    "gecko": {
      "id": "weronika.ttvfs@example.com"
    }
  }
}