Examine source code of Smooth Auto Scroll

{
  "manifest_version": 2,
  "name": "Smooth Auto Scroll",
  "version": "1.0.5",
  "description": "Step-based auto scroll with speed control, auto-reverse (ping-pong), loop mode, and auto reload after full cycle.",
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Auto Scroll"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "Toggle Autoscroll": {
      "suggested_key": {
        "default": "Alt+J",
        "mac": "Alt+J"
      },
      "description": "Pause/Resume autoscroll on current page"
    },
    "toggle-scroll": {
      "suggested_key": {
        "default": "Alt+S",
        "mac": "Alt+S"
      },
      "description": "Start/Stop autoscroll"
    },
    "toggle-direction": {
      "suggested_key": {
        "default": "Alt+D",
        "mac": "Alt+D"
      },
      "description": "Toggle direction"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "smooth-autoscroll@example.com",
      "strict_min_version": "78.0"
    }
  }
}