Examine source code of Let It Scroll

{
  "manifest_version": 2,
  "name": "Let It Scroll",
  "version": "1.0",
  "description": "Smooth automatic scrolling with adjustable speed.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon64.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b78ba141-8bcc-4ff4-86ad-3f3674d94278}",
      "strict_min_version": "106.0"
    }
  }
}