Examine source code of NotesTab

{
  "manifest_version": 2,
  "name": "NotesTab",
  "version": "1.6resigned1",
  "description": "Changes new tab to a very simple text editor with custom notes",
  "icons": {
    "16": "icon16.png",
    "24": "icon24.png",
    "48": "icon48.png",
    "96": "icon96.png"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{286bd36e-0477-4b14-bad8-881e279dbdb8}"
    }
  }
}