Examine source code of GeoMask - Mask Location & Timezone

{
  "manifest_version": 3,
  "name": "GeoMask - Mask Location & Timezone",
  "version": "1.0.0",
  "description": "Mask your location, timezone, and WebRTC by choosing a new location or by auto-syncing with your VPN connection.",
  "permissions": [
    "storage",
    "scripting",
    "privacy"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "geomask@geomask.org",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/bridge.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "ISOLATED"
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/inject.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "world": "MAIN"
    }
  ],
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  }
}