Examine source code of WhatsApp Blur

{
  "name": "WhatsApp Blur",
  "version": "1.0.4",
  "description": "Blur and Hides your messages until you hover over them.",
  "permissions": [
    "tabs",
    "storage",
    "https://web.whatsapp.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "images/statusOn.png",
    "images/statusOff.png",
    "css/messages.css",
    "css/messagesPreview.css",
    "css/lastMessages.css",
    "css/mediaPreview.css",
    "css/mediaGallery.css",
    "css/textInput.css",
    "css/profilePic.css",
    "css/name.css",
    "css/noDelay.css",
    "css/unblurActive.css"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/"
      ],
      "js": [
        "load.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Privacy Extension For WhatsApp Web",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png"
    }
  },
  "commands": {
    "toggle": {
      "suggested_key": {
        "default": "Alt+X"
      },
      "description": "Toggle On/Off"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{acefccdf-ac02-4194-b91b-e0864a677961}"
    }
  }
}