Examine source code of Scroll To Top Android

{
  "manifest_version": 2,
  "name": "ScrollToTop",
  "version": "1.1",
  "description": "Adds a scroll to top button for the Mozilla Firefox browser. Intended for Firefox for Android.",
  "homepage_url": "https://github.com/lamelameo/ScrollToTop-Firefox-for-Android-Extension",
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "permisisons": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "scrolltotop@lameo.com",
      "strict_min_version": "54.0"
    }
  },
  "web_accessible_resources": [
    "images"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "scroll_button.css"
      ],
      "js": [
        "scroll_button.js"
      ]
    }
  ]
}