Examine source code of Zotref Checker for Zotero

{
  "manifest_version": 2,
  "name": "Zotref Checker",
  "version": "0.4.23",
  "description": "Indicates items found in Zotero on Google Scholar search results and adds in-browser actions. Customize in Extensions -> Details -> Extension options.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "http://127.0.0.1/*",
    "http://localhost/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "optional_permissions": [
    "https://*/*"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f89c5769-8b96-4ace-a13b-84503575f7f6}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://scholar.google.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}