Examine source code of HackerCreep

{
  "description": "Merging Pinboard.in and HackerNews to bring about Armageddon.",
  "manifest_version": 2,
  "name": "HackerCreep",
  "version": "1.2resigned1",
  "homepage_url": "https://blog.pythonaro.com",
  "applications": {
    "gecko": {
      "id": "hackercreep@pythonaro.com",
      "strict_min_version": "56.0a1",
      "strict_max_version": "60.0"
    }
  },
  "permissions": [
    "storage",
    "*://hn.algolia.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.pinboard.in/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "icons/loader.gif",
    "icons/favicon.ico"
  ]
}