Examine source code of Arrow Scroll Boost

{
  "manifest_version": 3,
  "name": "Arrow Scroll Boost",
  "version": "1.1",
  "description": "Make the speed of the up and down arrow changeable on all sites.",
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "arrowscrollboost@pralexio.fr"
    }
  }
}