Examine source code of Mobile simulator - responsive testing tool

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "author": "François Duprat",
  "permissions": [
    "webRequest",
    "scripting",
    "tabs",
    "activeTab",
    "declarativeNetRequest",
    "webNavigation",
    "storage",
    "contextMenus"
  ],
  "host_permissions": [
    "<all_urls>",
    "*://*/*"
  ],
  "icons": {
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "action": {
    "default_title": "__MSG_context_menu_activate__",
    "default_icon": {
      "32": "icons/32.png",
      "48": "icons/48.png"
    }
  },
  "commands": {
    "take-screenshot-1": {
      "description": "__MSG_screenshot_menu_1__"
    },
    "take-screenshot-2": {
      "description": "__MSG_screenshot_menu_2__"
    },
    "take-screenshot-3": {
      "description": "__MSG_screenshot_menu_3__"
    },
    "take-screenshot-4": {
      "description": "__MSG_screenshot_menu_4__"
    },
    "start-stop-video-capture": {
      "description": "__MSG_menu_screencast__"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/frame-element-spoofer.js"
      ],
      "run_at": "document_start",
      "world": "MAIN",
      "all_frames": true
    },
    {
      "matches": [
        "https://www.webmobilefirst.com/*"
      ],
      "js": [
        "js/message.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "spoofer.js",
        "assets/**/*",
        "fonts/icomoon.ttf",
        "css/**/*",
        "icons/**/*",
        "workers/*.js",
        "pages/permission/micro.html",
        "pages/permission/camera.html",
        "pages/permission/requestMicroPermission.ts",
        "pages/permission/requestCameraPermission.ts"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; connect-src 'self' blob: data: https://bixsctseziswsruplxzm.supabase.co https://jth7w9hc3m.execute-api.eu-west-3.amazonaws.com wss://uqq63cvgfe.execute-api.eu-west-3.amazonaws.com/prod/ https://y13qoxjas8.execute-api.eu-west-3.amazonaws.com https://webmobilefirst-screencasts.s3.eu-west-3.amazonaws.com https://us.i.posthog.com https://mobile-first-extension-temp-webm-video-captures.s3.eu-west-3.amazonaws.com; img-src 'self' blob: data:; media-src 'self' blob:"
  },
  "version": "4.20.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "{edfc63b3-fc9b-4b6b-b9bf-4561ad548044}",
      "strict_min_version": "128.0"
    }
  }
}