Examine source code of Scientific Fact Flash

{
  "manifest_version": 2,
  "name": "Scientific Fact Flash",
  "version": "1.0",
  "description": "Show a fun scientific fact each time a new tab is opened.",
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [],
  "browser_action": {
    "default_title": "Scientific Fact Flash"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4fb9586c-9994-44c5-8be9-7c6ef1b803ae}"
    }
  }
}