Examine source code of JP Region Spoofer

{
  "manifest_version": 2,
  "name": "JP Region Spoofer",
  "version": "1.1.0",
  "description": "Spoof browser region to Japan: geolocation, timezone, user-agent, hardware fingerprint, WebRTC, and more.",
  "author": "JP Spoofer",
  "browser_specific_settings": {
    "gecko": {
      "id": "jp-spoofer@example.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "privacy",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/inject.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "JP Region Spoofer"
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    "content/spoofer.js"
  ]
}