Examine source code of Feature Flags

{
  "name": "Feature Flags",
  "version": "0.3.0",
  "description": "Manage your feature flags",
  "manifest_version": 2,
  "author": "Simon de Bruijn",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Feature Flags"
  },
  "permissions": [
    "cookies",
    "tabs",
    "storage",
    "*://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9bbc1976-a3eb-4654-9803-60454a407075}"
    }
  }
}