Examine source code of colm

{
  "manifest_version": 2,
  "name": "colm",
  "version": "2.2.0",
  "description": "Replaces new tab with Markdown-powered columns",
  "author": "kevinfiol",
  "homepage_url": "https://kevinfiol.com",
  "developer": {
    "name": "kevinfiol",
    "url": "https://kevinfiol.com"
  },
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  }
}