Examine source code of RSS Viewer

{
  "manifest_version": 2,
  "name": "RSS Viewer",
  "version": "0.1.4",
  "description": "An easy way to render RSS feeds directly in your browser",
  "page_action": {
    "default_icon": {
      "16": "assets/icon-gray-16.png",
      "48": "assets/icon-gray-48.png",
      "128": "assets/icon-gray-128.png"
    },
    "default_title": "Detected an RSS/Atom feed"
  },
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "background": {
    "scripts": [
      "assets/background-c101863b.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "assets/main-f0af51bc.js"
      ],
      "matches": [
        "*://*/*"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "viewer/index.html",
    "chunks/browser-polyfill-f7d8c34f.js",
    "main.js"
  ],
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a01536c3-3fbe-4fc3-999c-a69b97118474}"
    }
  }
}