Mobile simulator - responsive testing tool

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "author": "François Duprat",
  "permissions": [
    "tabs",
    "activeTab",
    "<all_urls>",
    "*://*/*",
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "storage",
    "cookies",
    "tabCapture",
    "contextMenus"
  ],
  "icons": {
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/has_mobile_first_extension.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "__MSG_context_menu_activate__",
    "default_icon": {
      "32": "icons/32.png",
      "48": "icons/48.png"
    }
  },
  "web_accessible_resources": [
    "spoofer.js",
    "assets/**/*",
    "css/**/*"
  ],
  "externally_connectable": {
    "matches": [
      "https://www.webmobilefirst.com/*"
    ]
  },
  "version": "3.10.2",
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'"
}