Examine source code of Lazy Tabs (Tab Suspender)

{
  "manifest_version": 2,
  "name": "Lazy Tabs (Tab Suspender)",
  "description": "Automatically suspend inactive tabs to save memory",
  "version": "0.7.5",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "84": "icon/84.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "alarms"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "lazy-tabs@e1024kb",
      "strict_min_version": "145.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "toggle-tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+U",
        "mac": "Alt+Shift+S"
      },
      "description": "Suspend or restore current tab"
    },
    "toggle-all": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "Alt+Shift+A"
      },
      "description": "Suspend or restore all tabs"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Tab Suspender",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}