Examine source code of Bezel — Responsive Tester & Device Emulator

{
  "manifest_version": 3,
  "name": "Bezel — Responsive Tester & Device Emulator",
  "description": "Test responsive design on 90+ device frames, phones to foldables. Accurate touch, DPR & client-hint emulation. Free, no ads.",
  "version": "0.3.1",
  "short_name": "Bezel",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "webNavigation",
    "tabs",
    "unlimitedStorage",
    "webRequest",
    "webRequestBlocking"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "Bezel"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "bezel@webmobilebezel.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "js": [
        "content-scripts/shim.js"
      ],
      "world": "MAIN"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content-scripts/overlay.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}