Examine source code of Fast Scroll

{
  "manifest_version": 3,
  "name": "Fast Scroll",
  "version": "0.2.0",
  "description": "Brings fast vertical scroll, fast horizontal scroll and fast zoom",
  "author": "Fuwei Chin",
  "icons": {
    "16": "icons/icon_16x16.png",
    "32": "icons/icon_32x32.png",
    "48": "icons/icon_48x48.png",
    "128": "icons/icon_128x128.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true
    }
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon_16x16.png",
      "32": "icons/icon_32x32.png"
    },
    "default_title": "Fast Scroll Usage",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fast-scroll@addons.mozilla.org",
      "strict_min_version": "114.0"
    }
  }
}