Examine source code of RSS Feed Reader v2

{
  "manifest_version": 2,
  "name": "RSS Feed Reader",
  "version": "1.0",
  "description": "View RSS feeds from your favorite websites directly in your browser.",
  "permissions": [
    "storage",
    "https://*/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2e08d0d8-7c89-4903-baad-e71f5bfba3b9}"
    }
  }
}