Examine source code of Sentiment Highlighter

{
  "manifest_version": 2,
  "name": "Sentiment Highlighter",
  "version": "1.0",
  "description": "Highlight web content based on sentiment analysis (positive, negative, neutral).",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_title": "Sentiment Highlighter",
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdb21e2d-e430-4ab2-ae8f-b33540465f97}"
    }
  }
}