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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Periodic Table",
  "description": "A simple periodic table of the elements designed to be beautiful and user-friendly.",
  "version": "3.5",
  "app": {
    "launch": {
      "local_path": "table.html"
    }
  },
  "icons": {
    "16": "icon_16.png",
    "128": "icon_128.png"
  }
}