Examine source code of SteemKeychain

{
  "name": "__MSG_keychain__",
  "description": "__MSG_description__",
  "default_locale": "en",
  "version": "3.0.2",
  "permissions": [
    "storage",
    "idle",
    "alarms"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "/assets/images/iconsteem.png"
  },
  "icons": {
    "128": "/assets/images/iconsteem.png"
  },
  "background": {
    "scripts": [
      "backgroundBundle.js"
    ],
    "persistent": true
  },
  "web_accessible_resources": [
    "/images/logo.png",
    "steem_keychain.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*/*",
        "http://0.0.0.0:1337/*",
        "http://*/*"
      ],
      "js": [
        "web_interfaceBundle.js",
        "keychainifyBundle.js"
      ],
      "all_frames": true
    }
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{b5de0de8-6fdd-434e-916a-ed976ac23ced}"
    }
  }
}