Examine source code of Webmaster Todo

{
  "description": "Simple ToDo List per webpage, help keep track of stuff to do for webmaster or designer. All data is stored locally",
  "manifest_version": 2,
  "name": "Webmaster Todo",
  "version": "1.2resigned1",
  "homepage_url": "https://github.com/haircutstar/website_todo_webext",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/logo_32.png",
    "default_title": "Webmaster ToDo",
    "default_popup": "popup/index.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ad77d027-1ba8-4399-ae3c-dbec27b5c29a}"
    }
  }
}