Examine source code of WebXR API Emulator

{
  "name": "WebXR API Emulator",
  "short_name": "WebXR Emu",
  "version": "0.3.3",
  "minimum_chrome_version": "10.0",
  "devtools_page": "src/extension/devtools.html",
  "description": "WebXR API Emulator",
  "homepage_url": "https://github.com/MozillaReality/WebXR-emulator-extension",
  "author": "Takahiro Aoyagi",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "src/extension/background.js"
    ]
  },
  "permissions": [
    "file://*/*",
    "http://*/*",
    "https://*/*",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "file://*/*",
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "polyfill/webxr-polyfill.js",
        "src/ConfigurationManager.js",
        "src/extension/content-script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "WebXR API Emulator",
    "default_popup": "src/extension/popup.html"
  },
  "manifest_version": 2,
  "web_accessible_resources": [
    "src/devices.json",
    "assets/hall_empty.glb"
  ]
}