View source for MediaWiki:Monobook.js

/* All JavaScript here will be loaded for users of the MonoBook skin */
document.addEventListener('DOMContentLoaded', function() {
    var logo = document.querySelector('.mw-wiki-logo');
    if (logo) {
        logo.style.filter = 'none'; // Remove any filters
        logo.style.backgroundImage = "url('path/to/original/logo/image.png')"; // Set the original logo image
        // Set any other styles as needed
    }
});