Examine source code of Scre.io for Firefox

{
  "manifest_version": 3,
  "name": "Scre.io for Firefox",
  "version": "1.0",
  "description": "An alternative Scre.Io for Firefox.",
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "16": "favicon-16x16.png",
    "32": "favicon-32x32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "qvu217720@gmail.com",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "activeTab"
  ]
}