Examine source code of Code Verify

{
  "manifest_version": 2,
  "name": "Code Verify",
  "version": "4.1.0",
  "default_locale": "en",
  "description": "An extension to verify the code running in your browser matches what was published.",
  "page_action": {
    "default_title": "Code Verify",
    "default_icon": {
      "32": "default_32.png",
      "48": "default_48.png",
      "64": "default_64.png",
      "128": "default_128.png"
    }
  },
  "icons": {
    "32": "default_32.png",
    "48": "default_48.png",
    "64": "default_64.png",
    "128": "default_128.png"
  },
  "background": {
    "persistent": true,
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.messenger.com/*"
      ],
      "all_frames": true,
      "js": [
        "contentMSGR.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "contentFB.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.instagram.com/*"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "contentIG.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.whatsapp.com/*"
      ],
      "all_frames": true,
      "match_about_blank": true,
      "js": [
        "contentWA.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "webRequest",
    "storage",
    "https://*.privacy-auditability.cloudflare.com/*",
    "https://static.xx.fbcdn.net/",
    "https://static.cdninstagram.com/",
    "https://static.whatsapp.net/",
    "*://*.messenger.com/*",
    "*://*.facebook.com/*",
    "*://*.instagram.com/*",
    "*://*.whatsapp.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bc6ba8b6-2502-4610-98f7-f639a2c9b8a1}"
    }
  }
}