Examine source code of MemoryGuard

{
  "manifest_version": 2,
  "name": "MemoryGuard",
  "version": "1.0",
  "description": "Suspend inactive tabs to save memory and improve browser performance",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_title": "MemoryGuard",
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4c5da9b6-6716-48a1-aefb-66732ba47bca}"
    }
  }
}