This a one-line receiver plugin to make the 'Hold mouse wheel down to tune' setting enabled by default.
This setting allows you to use the mouse scroll to zoom into the waterfall.
By default, the state of this checkbox is stored in localStorage in your browser. If you often delete your browser's cache and localStorage contents, this plugin might be useful.

Add this lines in your init.js file:

Plugins.load('https://0xaf.github.io/openwebrxplus-plugins/receiver/tune_checkbox/tune_checkbox.js');

Learn how to load plugins.