Examine source code of TabSweeper

{
  "manifest_version": 2,
  "name": "TabSweeper",
  "version": "1.0.1",
  "description": "Closes all tabs with given urls",
  "icons": {
    "16": "icons/magic-sweeper-16.png",
    "32": "icons/magic-sweeper-32.png",
    "64": "icons/magic-sweeper-64.png",
    "96": "icons/magic-sweeper-96.png",
    "128": "icons/magic-sweeper-128.png"
  },
  "permissions": [
    "tabs",
    "notifications",
    "storage"
  ],
  "browser_action": {
    "default_title": "Tab Sweeper",
    "default_icon": "icons/magic-sweeper-64.png",
    "default_popup": "popup/tab-sweeper.html"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  }
}