Examine source code of OpenTrends

{
  "manifest_version": 2,
  "name": "OpenTrends",
  "description": "Integrates OpenTrends inside GitHub, allowing you to see repositories rating and subscribe to them without leaving GitHub.",
  "version": "1.4.2resigned1",
  "icons": {
    "16": "icons/icon-16px.png",
    "48": "icons/icon-48px.png",
    "64": "icons/icon-64px.png",
    "128": "icons/icon-128px.png"
  },
  "permissions": [
    "cookies",
    "https://*.open-trends.com/*",
    "*://*.open-trends.com/*",
    "https://*.github.com/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "dist/background_cookies.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.open-trends.com/*",
        "https://*.github.com/*"
      ],
      "js": [
        "dist/index.js"
      ],
      "css": [
        "dist/index.css"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bc681f40-66c1-40ed-8a5e-b0eb459dc922}"
    }
  }
}