Examine source code of Ahrefs SEO Toolbar

{
  "version": "3.2.9",
  "name": "Ahrefs SEO Toolbar",
  "description": "__MSG_manifest_description__",
  "homepage_url": "https://ahrefs.com/",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "exclude_matches": [
        "https://www.bing.com/*",
        "https://www.facebook.com.login.php/",
        "*://*/*.pdf",
        "*://*/*.txt",
        "*://*/*.xml"
      ],
      "exclude_globs": [
        "https://*.ahrefs.com/*",
        "https://*.ahrefs.me/*"
      ],
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-service.js"
      ],
      "exclude_matches": [
        "https://www.bing.com/*",
        "https://www.facebook.com.login.php/",
        "*://*/*.pdf",
        "*://*/*.txt",
        "*://*/*.xml"
      ],
      "exclude_globs": [
        "https://*.ahrefs.com/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "images/colored-48.png",
    "64": "images/colored-64.png",
    "128": "images/colored-128.png"
  },
  "default_locale": "en",
  "manifest_version": 2,
  "permissions": [
    "*://*/*",
    "identity",
    "tabs",
    "storage",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "event.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ahrefs@AhrefsPteLtd"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "windows": "Alt+S",
        "linux": "Alt+S",
        "mac": "MacCtrl+Command+S",
        "default": "Alt+S"
      }
    },
    "toggle-page-metrics": {
      "suggested_key": {
        "windows": "Alt+A",
        "linux": "Alt+A",
        "mac": "MacCtrl+Command+A",
        "default": "Alt+A"
      },
      "description": "Toggle Metrics bar"
    }
  },
  "web_accessible_resources": [
    "images/countries/*.svg",
    "images/check.svg"
  ]
}