Examine source code of Tweet Jumper

{
  "manifest_version": 2,
  "name": "Tweet Jumper",
  "version": "1.0",
  "description": "Arcade/platformer that generates levels from real tweets.",
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "https://api.twitter.com/"
  ],
  "browser_action": {
    "default_title": "Tweet Jumper",
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "tweet_jumper@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}