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manifest.json
{
  "manifest_version": 2,
  "name": "Background",
  "version": "2.6",
  "description": "Adds background in new tabs",
  "icons": {
    "48": "icons/border-48.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4254e215-ed1a-4330-a04d-8de626c36215}"
    }
  }
}