Examine source code of Advanced Scroll & Navigation

{
  "manifest_version": 3,
  "name": "Advanced Scroll & Navigation",
  "version": "26.0",
  "description": "Jump to the top/bottom, scroll anywhere, automatic page scrolling with adjustable speed, tab navigation, and customizable shortcut keys.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "site-defaults.js",
        "button-styles.js",
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "background": {
    "scripts": [
      "site-defaults.js",
      "background.js"
    ]
  },
  "action": {
    "default_title": "Advanced Scroll & Navigation",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    },
    "default_popup": "popup/popup.html"
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "swiftscroll@ovy.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "author": "Aminul Huq Ovy",
  "commands": {
    "previous-tab": {
      "suggested_key": {
        "default": "Ctrl+Alt+Left"
      },
      "description": "Switch to the previous browser tab"
    },
    "next-tab": {
      "suggested_key": {
        "default": "Ctrl+Alt+Right"
      },
      "description": "Switch to the next browser tab"
    },
    "last-used-tab": {
      "suggested_key": {
        "default": "Ctrl+Alt+Down"
      },
      "description": "Switch to the previously active tab"
    }
  }
}