Examine source code of History Overrid

{
  "manifest_version": 2,
  "name": "History Overrid",
  "description": "Overrides the History Page",
  "version": "3.2",
  "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": "{f9d43888-0f36-4b8c-b5f2-f5f595547ddf}"
    }
  }
}