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manifest.json
{
  "manifest_version": 2,
  "name": "Top Sites",
  "description": "Shows a list of top sites you've visited.",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "version": "1.0",
  "chrome_url_overrides": {
    "newtab": "sites.html"
  },
  "permissions": [
    "topSites"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "54.0a1",
      "id": "{757d1b06-72be-42a5-a1d4-72bf78ead941}"
    }
  }
}