Examine source code of ScrollUp

{
  "manifest_version": 2,
  "name": "ScrollUp",
  "version": "3.6",
  "description": "Smart scroll to top button with global settings and resize feature",
  "author": "Dipto Design",
  "homepage_url": "https://diptodesign.github.io/clifydl/extensions.html",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js",
        "analytics.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "web_accessible_resources": [
    "icons/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_title": "ScrollUp",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "scrollup@dipto.design",
      "strict_min_version": "140.0",
      "strict_min_version_for_android": "142.0",
      "data_collection_permissions": {
        "required": [
          "websiteActivity"
        ],
        "optional": [
          "technicalAndInteraction"
        ]
      }
    }
  }
}