Examine source code of vim-scroll

{
  "manifest_version": 3,
  "name": "vim-scroll",
  "browser_specific_settings": {
    "gecko": {
      "id": "{bc095b27-020f-473c-a75d-944762c16400}"
    }
  },
  "version": "5.0.1",
  "icons": {
    "128": "jk.png"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "vim-scroll.js"
      ]
    }
  ]
}