Remove coupon field when Coupert extension is detected. Adjustable to also block Capital One Shopping, Rakuten, CouponCabin Sidekick, Dealfinder, RetailMeNot, Ibotta and Honey

remove-coupon-field-when-coupert-is-detected.js

(function() {
    var detectExtension = function(url, ifInstalled, ifNotInstalled) {
        var link = document.createElement('link');
        link.rel = 'stylesheet';
        link.href = url;

        link.onload = ifInstalled;
        link.onerror = ifNotInstalled || function() {};
        
        document.head.appendChild(link);
    };

    detectExtension(
        // Change the below URL to a web accessible resource in the Chrome extension
        // For the Chrome ID, see the Chrome extension on the Chrome Web Store and check the address bar for the URL
        // For the filename, download the CRX with https://crxextractor.com/ and rename it to .zip
        // Extract it and see web_accessible_resources in the manifest.json of the crx (zip) file and pick a css/font file
        
        'chrome-extension://mfidniedemcgceagapgdekdbmanojomk/css/font.css',
        function() {
            var selector = '#coupon-code-input-field';
            var target = document.querySelector(selector);
            if (target && target.parentNode) {
                target.parentNode.removeChild(target);
                console.log('Coupert detected, removed coupon code field.');
            }
        }
    );
})();