Examine source code of Scholar Metrics Enhancer

{
  "manifest_version": 2,
  "name": "Scholar Metrics Enhancer",
  "version": "0.1.2",
  "description": "Adds SJR and Open Access info to Google Scholar results",
  "permissions": [
    "storage",
    "https://scholar.google.com/*",
    "https://api.crossref.org/*",
    "https://api.openalex.org/*"
  ],
  "background": {
    "scripts": [
      "background.js",
      "scripts/utils.js",
      "scripts/crossref.js",
      "scripts/openalex.js",
      "scripts/scholar.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://scholar.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "graphics/icon16.png",
    "32": "graphics/icon32.png",
    "48": "graphics/icon48.png",
    "128": "graphics/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "graphics/icon16.png",
      "32": "graphics/icon32.png",
      "48": "graphics/icon48.png",
      "128": "graphics/icon128.png"
    },
    "default_title": "Scholar Metrics Enhancer",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "scholar.metrics.ext@aft.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}