Examine source code of KindSearch

{
  "manifest_version": 2,
  "name": "KindSearch",
  "version": "0.4.0",
  "icons": {
    "16": "assets/icons/favicon-16.png",
    "32": "assets/icons/favicon-32.png",
    "48": "assets/icons/favicon-48.png",
    "128": "assets/icons/favicon-128.png"
  },
  "description": "Search the web to support a cause!",
  "homepage_url": "https://kindsearch.org",
  "short_name": "KindSearch",
  "permissions": [
    "contextMenus",
    "cookies",
    "https://kindsearch.org/*",
    "https://*.kindsearch.org/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "author": "sallar",
  "applications": {
    "gecko": {
      "id": "{042d1aa6-6e0c-4ee1-be8a-3f4e8ccd2190}"
    }
  },
  "chrome_settings_overrides": {
    "search_provider": {
      "name": "KindSearch",
      "search_url": "https://kindsearch.org/search?q={searchTerms}&source=firefox",
      "suggest_url": "https://kindsearch.org/api/ac/browser?q={searchTerms}&source=firefox",
      "encoding": "UTF-8",
      "keyword": "kindsearch",
      "is_default": true,
      "favicon_url": "https://kindsearch.org/favicon.ico"
    }
  },
  "background": {
    "scripts": [
      "js/background.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://kindsearch.org/*",
        "https://*.kindsearch.org/*"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ]
    }
  ]
}