Examine source code of Better Overcast

{
  "manifest_version": 2,
  "name": "Better Overcast",
  "version": "1.3",
  "description": "Make navigating the Overcast active podcasts a bit easier",
  "permissions": [
    "*://overcast.fm/*",
    "storage"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://overcast.fm/podcasts"
      ],
      "js": [
        "index.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ]
}