Examine source code of mythos-navigation

{
  "description": "just simple navigation page, compatible chrome ",
  "manifest_version": 2,
  "name": "mythos-navigation",
  "version": "1.5.4resigned1",
  "homepage_url": "https://github.com/Kuangcp/LearnWebExtension/tree/master/mythos-navigation",
  "icons": {
    "48": "icons/48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_action": {
    "default_icon": "icons/32.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2389026f-2017-446f-87f9-ddb240ea3770}"
    }
  }
}