Examine source code of Article Highlighter

{
  "manifest_version": 2,
  "name": "Article Highlighter",
  "version": "1.0",
  "description": "Highlight text on web pages and save these highlights for later reference.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{70725a04-4c4f-4412-8915-1ea7f6e77504}"
    }
  }
}