Examine source code of Quick apps

{
  "manifest_version": 3,
  "name": "quick apps",
  "description": "open your go to tabs in one click",
  "version": "1.0",
  "action": {
    "default_title": "My Apps",
    "default_popup": "index.html",
    "default_icons": {
      "16": "1.PNG",
      "128": "1.PNG"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{27ee0901-612a-4fe2-9ad8-f875cc2322bf}",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "tabs",
    "<all_urls"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}