Examine source code of Tab Funnel

{
  "manifest_version": 2,
  "name": "Tab Funnel",
  "description": "Funnels all tabs into a list",
  "version": "1.4.2",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "unlimitedStorage",
    "tabs",
    "downloads",
    "menus",
    "alarms"
  ],
  "omnibox": {
    "keyword": "tf"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{322171a2-2a66-4ecf-9dcc-bd84b282d352}"
    }
  },
  "default_locale": "en",
  "chrome_url_overrides": {
    "newtab": "dashboard.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "TabFunnel",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}