After reading [this](http://meta.stackexchange.com/questions/19574/highlight-comments-from-answer-author-in-addition-to-question-author), I really liked the idea, so I made a Userscript to highlight answerer's names.

The [script](https://gist.github.com/shu8/0e129717497ba192f0d8):

        // ==UserScript==
    // @name         Highlight answerer's comments
    // @namespace    http://stackexchange.com/users/4337810/%E1%B9%A7%D0%BD%CA%8A%C3%9F
    // @version      0.2
    // @description  Highlight's the names of answerer's on SE websites
    // @author       ṧнʊß (http://stackexchange.com/users/4337810/%E1%B9%A7%D0%BD%CA%8A%C3%9F)
    // @match 		 *://*.stackexchange.com/*
    // @match 		 *://*.stackoverflow.com/*
    // @match		 *://*.superuser.com/*
    // @match		 *://*.serverfault.com/*
    // @match		 *://*.askubuntu.com/*
    // @match		 *://*.stackapps.com/*
    // @match		 *://*.mathoverflow.net/*
    // @grant        none
    // ==/UserScript==
    
    function colorAnswerer() {
        $('.answercell').each(function(x, obj) {
            var x = $(this).find('.user-details a').text();
            $('.answer .comment-user').each(function(i) {
                if ($(this).text() == x) { 
                    $(this).css('background-color', 'orange');
                }
            });        
        });
    }
    
    $(document).ready(function() {
        $('.comments').bind('DOMNodeInserted DOMNodeRemoved', function(event) {
        	if (event.type == 'DOMNodeInserted' || event.type == 'DOMNodeInserted') {
            	colorAnswerer();
    		}
        });
    });

It might be buggy - I've only tested it on Chrome on a few questions across the network. Please post bug reports! :)

![enter image description here][1]

Change Log
---

- 06/01/15 - v0.2: Fixed bug where CSS was removed after clicking `show x more comments`.
- 15/01/15 - v0.3: Fixed deprecation of v0.2 (DOMNodeInserted)

<sub>(NORMAL dates, not American ones ;p)</sub>
  [1]: https://i.sstatic.net/O0FTe.png