Examine source code of Leads tracker

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Leads tracker",
  "description": "Save and track your leads easily from any website",
  "browser_specific_settings": {
    "gecko": {
      "id": "leads-tracker@yourdomain.com",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icon.png"
  },
  "permissions": [
    "tabs"
  ]
}