Examine source code of Babbel Web Companion

{
  "manifest_version": 2,
  "name": "Babbel Web Companion",
  "version": "1.0.0",
  "description": "Quick access and small helpers for Babbel Web — lesson quick-links, vocab lookup, and reminders.",
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs",
    "storage",
    "notifications"
  ],
  "browser_action": {
    "default_title": "Babbel Web Companion",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0229987-4971-4f30-a79c-4ec50bc903f7}"
    }
  }
}