Script to dim some SERP in Chrome; requires Control Freak extension.

hideGoogleSerp.js

(function(domains) {
  var to,
      observer,
      // 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;

          // Loop through passed domains
          for (domainsI = 0; domainsI < domainsL; domainsI = domainsI + 1) {
            // Loop through links
            for (i = 0; i < l; i = i + 1) {
              // Link has matching href attr
              if (links[i].href && links[i].href.match('/' + domains[domainsI] + '/')) {
                if (links[i].parentElement.parentElement.className.match(/^rc$/) && !links[i].parentElement.parentElement.$$hiddenSerp) {
                  // Mark element for easier skipping
                  links[i].parentElement.parentElement.$$hiddenSerp = true;
                  // Set opacity
                  links[i].parentElement.parentElement.style.opacity = 0.25;
                }
              }
            }
          }
        }
      },
      // Function to look for the div#search element
      lookForSearchElement = function() {
        search = document.getElementById('search');
        
        // If already found...
        if (search) {
          // ...clear timeout hack from below
          clearInterval(to);
          // Start links lookup
          to = setTimeout(lookForAnchorElements, 300);
          
          // Set-up observer
          observer = new MutationObserver(function() {
            // Clear previous link lookup
            clearTimeout(to);
            // Set new lookup
            to = setTimeout(lookForAnchorElements, 300);
          }).observe(
            // Observed element
            search,
            // Observiing options
            {childList: true, subtree: true, attributes: true}
          );
        }
      };
  
  // Loop until div#search element appears in DOM
  to = window.setInterval(lookForSearchElement, 300);
}(['www.anyannoyingdomain.com'])); // Array of regexes of annoying domains you want to dimm