Examine source code of Dual Language Reader

{
  "manifest_version": 2,
  "name": "Dual Language Reader",
  "version": "1.0",
  "description": "Show bilingual view for foreign articles.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8340b77-b58a-4b5c-9715-61c2e5006eea}"
    }
  }
}