Examine source code of Sales Notifier

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "2.0.0",
  "description": "__MSG_extDescription__",
  "default_locale": "pt_BR",
  "permissions": [
    "notifications",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "config.js",
      "background/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sales-notifier@marketplace",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}