Examine source code of TryWebKits Helper Kit

{
  "manifest_version": 3,
  "name": "TryWebKits Helper Kit",
  "version": "1.0.0",
  "description": "All-in-one browser toolkit for devs, designers & marketers. SEO audit, design inspector, utilities, page forensics, and bulk tools.",
  "browser_specific_settings": {
    "gecko": {
      "id": "trywebkits-helper-kit@trywebkits.com",
      "strict_min_version": "152.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "152.0"
    }
  },
  "action": {
    "default_popup": "src/popup/index.html",
    "default_title": "TryWebKits Helper Kit"
  },
  "options_ui": {
    "page": "src/options/index.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "favicon.png",
    "32": "favicon.png",
    "48": "favicon.png",
    "128": "favicon.png"
  },
  "background": {
    "scripts": [
      "src/background/service-worker.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/main.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "tabs",
    "contextMenus",
    "browsingData",
    "clipboardWrite",
    "cookies",
    "webRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+K",
        "mac": "Command+Shift+K"
      },
      "description": "Open TryWebKits Helper Kit"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; base-uri 'self'; form-action 'self'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self' data: https: http:"
  }
}