Examine source code of Fast Scroll

{
  "name": "Fast Scroll",
  "description": "Increase your browser's scrolling speed and navigate faster.",
  "version": "1.4.3",
  "manifest_version": 3,
  "author": "Fast Scroll <hello@fastscroll.io>",
  "icons": {
    "16": "images/brand/icons/16.png",
    "32": "images/brand/icons/32.png",
    "64": "images/brand/icons/64.png",
    "128": "images/brand/icons/128.png",
    "256": "images/brand/icons/256.png"
  },
  "action": {
    "default_icon": {
      "16": "images/brand/favicons/16.png",
      "32": "images/brand/favicons/32.png",
      "64": "images/brand/favicons/64.png",
      "128": "images/brand/favicons/128.png",
      "256": "images/brand/favicons/256.png"
    },
    "default_title": "Fast Scroll",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "firefox.addon@fastscroll.io",
      "strict_min_version": "109.0"
    }
  }
}