Examine source code of Game Prophet

{
  "manifest_version": 2,
  "name": "Game Prophet",
  "version": "0.3.0.6resigned1",
  "applications": {
    "gecko": {
      "id": "firefox-extension@gameprophet.gg",
      "strict_min_version": "57.0"
    }
  },
  "description": "Predict the future and win with Game Prophet",
  "icons": {
    "16": "16x16.png",
    "24": "24x24.png",
    "32": "32x32.png",
    "48": "48x48.png",
    "128": "128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "16x16.png",
      "24": "24x24.png",
      "32": "32x32.png",
      "48": "48x48.png",
      "128": "128x128.png"
    },
    "default_title": "Game Prophet",
    "default_popup": "popup-firefox.html"
  },
  "background": {
    "scripts": [
      "ably.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "mixpanel.js",
        "notifications.js",
        "injector.js"
      ],
      "css": [
        "style.css",
        "twitch.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "permissions": [
    "alarms",
    "storage",
    "identity",
    "<all_urls>",
    "webNavigation"
  ],
  "web_accessible_resources": [
    "redirect.html",
    "notification-brand.png",
    "gear-icon.png"
  ]
}