Tiny script to dim some Google SERPs in Chrome; requires Control Freak extension.

hideGoogleSerps.js

(function (w, domains) {
    'use strict';
    var to,
        // Google SERP div#search
        search,
        // Array of links
        links,
        // Passed arg iterator
        domainsI,
        // Passed arg length
        domainsL = domains.length,
        // Function to look for matching links
        lookForAnchorElements = function () {
            // Lookup links
            links = search.getElementsByTagName('a');

            if (links.length > 0) {
                var i, l = links.length, parent;

                // Loop through links
                for (i = 0; i < l; i = i + 1) {
                    // Loop through passed domains
                    for (domainsI = 0; domainsI < domainsL; domainsI = domainsI + 1) {
                        // Link has matching href attr
                        if (!links[i].$$hiddenSerp && links[i].href && links[i].href.match('/' + domains[domainsI] + '/')) {
                            // Get parent...
                            parent = links[i].parentElement;

                            // ... with proper class
                            while (parent.className !== 'g' || parent.nodeName.toLowerCase() === 'body') {
                                parent = parent.parentElement;
                            }

                            // (Something went wrong)
                            if (parent.className === 'g' && !parent.$$hiddenSerp) {
                                // Mark elements for easier skipping
                                parent.$$hiddenSerp = true;
                                links[i].$$hiddenSerp = true;

                                // Set opacity
                                parent.style.opacity = 0.25;
                            }
                        }
                    }
                }
            }
        },
        // Function to look for the div#search element
        lookForSearchElement = function () {
            search = w.document.getElementById('search');

            // If already found...
            if (search) {
                // ...clear timeout hack from below
                w.clearInterval(to);
                // Start links lookup
                to = w.setTimeout(lookForAnchorElements, 300);

                // Set-up observer
                new w.MutationObserver(function () {
                    // Clear previous link lookup
                    w.clearTimeout(to);
                    // Set new lookup
                    to = w.setTimeout(lookForAnchorElements, 300);
                }).observe(
                    // Observed element
                    search,
                    // Observiing options
                    {childList: true, subtree: true, attributes: true}
                );
            }
        };

    // Loop until div#search element appears in DOM
    to = w.setInterval(lookForSearchElement, 300);
}(window, ['www.anyannoyingdomain.com'])); // Array of regexes of annoying domains you want to dim