Examine source code of New Tab

{
  "manifest_version": 2,
  "version": "1.15.0",
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{3afde4e1-9644-4436-8e1f-80edab2b02b4}"
    }
  },
  "icons": {
    "48": "assets/icons/icon.svg",
    "96": "assets/icons/icon.svg",
    "128": "assets/icons/icon.svg"
  },
  "permissions": [
    "storage",
    "topSites",
    "tabs"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "browser_action": {
    "default_icon": "assets/icons/icon.svg",
    "default_title": "__MSG_shortcut__"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  }
}