Messenger Sneaky Mode - Hide what needs to be

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Messenger Sneaky Mode - Hide what needs to be",
  "short_name": "Messenger Sneaky Mode",
  "description": "You wanted to avoid everyone looking at your messages including the strongest spies, Messenger Sneaky Mode is for you.",
  "version": "1.3",
  "permissions": [
    "https://www.messenger.com/*",
    "storage"
  ],
  "browser_action": {
    "default_icon": "img/icon_240.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "128": "img/icon_64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.messenger.com/*"
      ],
      "css": [
        "blur.css"
      ],
      "js": [
        "blur.js"
      ],
      "run_at": "document_idle",
      "all frames": true
    }
  ],
  "web_accessible_resources": [
    "img/*"
  ]
}