Examine source code of Quick Scroll Buttons

{
  "manifest_version": 3,
  "name": "Quick Scroll Buttons",
  "version": "1.0.2",
  "description": "Adds scroll buttons to pages and allows custom hotkeys.",
  "author": "Tsuki",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script/scroller.js"
      ],
      "css": [
        "content_script/scroller.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "Quick Scroll Buttons Settings",
    "default_icon": {
      "48": "icons/icon-48.png"
    }
  },
  "commands": {
    "scroll-up": {
      "suggested_key": {
        "default": "Alt+Up"
      },
      "description": "Scroll Up"
    },
    "scroll-down": {
      "suggested_key": {
        "default": "Alt+Down"
      },
      "description": "Scroll Down"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "muchaoge0903@gmail.com"
    }
  }
}