Examine source code of Pixel Perfect Pro

{
  "name": "Pixel Perfect Pro",
  "description": "Helps developers to make pixel perfect site layout",
  "version": "1.9.4",
  "minimum_chrome_version": "88.0.884",
  "permissions": [
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>",
    "file://*/*"
  ],
  "optional_permissions": [
    "clipboardRead",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{66d5f9d5-c343-4806-bfa3-93dd0853174c}",
      "strict_min_version": "130.0"
    }
  },
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "128": "128.png"
  },
  "action": {
    "default_popup": "popup.select_frame.html"
  },
  "manifest_version": 3,
  "web_accessible_resources": [
    {
      "resources": [
        "runtime.js"
      ],
      "matches": [
        "<all_urls>",
        "file:///*/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>",
        "file:///*/*"
      ],
      "js": [
        "bridge.js"
      ],
      "all_frames": true
    }
  ]
}