Examine source code of RSS Reader

{
  "manifest_version": 2,
  "name": "RSS Reader",
  "version": "1.0",
  "description": "An addon for creating and managing RSS feed subscriptions.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "popup.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2088ad68-48aa-4704-8acc-38e3c2e0586c}"
    }
  }
}