Peeker

manifest.json

{
  "manifest_version": 3,
  "name": "Peeker",
  "version": "2.0.1.0",
  "description": "an extension that lets you peek on messages without opening them or marking them as read",
  "action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "scripting"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "host_permissions": [
    "*://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://web.telegram.org/a/*",
        "https://www.facebook.com/*",
        "https://www.instagram.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}