Examine source code of GreenCheck

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    },
    "default_popup": "popup.html"
  },
  "version": "0.3.0",
  "author": "GreenCheck",
  "name": "GreenCheck",
  "description": "GreenCheck is a browser extension that identifies websites running on green energy and does analysis on the site’s carbon emissions.",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dynamic-icon.55296f62.js"
      ],
      "css": []
    },
    {
      "matches": [
        "https://www.google.com/*"
      ],
      "js": [
        "search-results.2bec1223.js"
      ],
      "css": []
    }
  ],
  "host_permissions": [
    "https://*/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "greenchecksupport@proton.me"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "options.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "matches": [
        "https://www.google.com/*"
      ],
      "resources": [
        "search-results.0a3905ba.css"
      ]
    }
  ]
}