Examine source code of History Overrides

{
  "manifest_version": 2,
  "name": "History Overrides",
  "description": "Overrides the History Page",
  "version": "2.2",
  "chrome_url_overrides": {
    "history": "history.html"
  },
  "browser_action": {
    "default_title": "History"
  },
  "permissions": [
    "history",
    "chrome://favicon/"
  ],
  "icons": {
    "16": "history16.png",
    "32": "history32.png",
    "48": "history48.png",
    "128": "history128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{41e67140-ef2b-42a4-a9b3-758b4e9df8da}"
    }
  }
}