Examine source code of Tab Suspender V2

{
  "manifest_version": 2,
  "name": "Tab Suspender V2",
  "version": "1.3",
  "description": "A simple tab suspender to save memory by suspending inactive tabs.",
  "permissions": [
    "tabs",
    "storage",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{c1b2d8d5-5cde-4616-9105-d83ef8833158}"
    }
  }
}