Examine source code of CloseTabTimer

{
  "description": "Closes tabs on a timer",
  "manifest_version": 2,
  "name": "CloseTabTimer",
  "version": "1.0",
  "homepage_url": "https://github.com/AluminumChassis/CloseTabTimer",
  "icons": {
    "48": "icons/closetabs.png"
  },
  "background": {
    "scripts": [
      "CloseTabTimer.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/closetabs.png"
    },
    "default_title": "CloseTabTimer",
    "default_popup": "popup/default.html"
  }
}