Examine source code of WCount³

{
  "manifest_version": 3,
  "name": "WCount³",
  "version": "3.59",
  "description": "Counts words and more so you don't have to!",
  "icons": {
    "48": "icons/wordcountle-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wcount@monomolecular.net"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "wcount.js"
      ]
    },
    {
      "matches": [
        "https://wcount-base-editor.vercel.app/"
      ],
      "js": [
        "base-editor.js"
      ]
    }
  ],
  "sidebar_action": {
    "default_icon": "icons/wordcountle-48.png",
    "default_title": "WCount³",
    "default_panel": "sidebar/panel.html"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  }
}