Sheets Preview

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Sheets Preview",
  "description": "Offline spreadsheet preview. Open binary XLS (Microsoft Excel 95/97), XLSX, ODS OpenOffice files directly with this JavaScript app.",
  "version": "0.2",
  "manifest_version": 2,
  "minimum_chrome_version": "23",
  "icons": {
    "16": "icons/sheets-preview-16.png",
    "48": "icons/sheets-preview-48.png",
    "128": "icons/sheets-preview-128.png",
    "512": "icons/sheets-preview-512.png"
  },
  "permissions": [
    "clipboardRead",
    "clipboardWrite",
    {
      "fileSystem": [
        "write"
      ]
    }
  ],
  "offline_enabled": true,
  "file_handlers": {
    "handler_name": {
      "extensions": [
        "xls",
        "xlsx",
        "ods"
      ]
    }
  },
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  }
}