Examine source code of Tab Saver Timer

{
  "manifest_version": 2,
  "name": "Tab Saver Timer",
  "version": "1.0",
  "description": "Set timers for each tab. When the timer expires, the tab is bookmarked or closed to avoid overloading with unused tabs.",
  "permissions": [
    "tabs",
    "bookmarks",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1d8e277-c0d1-432c-952d-b5f003472506}"
    }
  }
}