I haven't used the Greasemonkey Firefox Extension much, but was recently introduced to a Link Highlighter Script on JohnBokma.com and I installed Greasemonkey to try the script.
It's a 16-line Greasemonkey script that you can customize and drop into your Firefox Browser so that all links to your site appear highlighted. It makes it really easy to pick out links to your site on Web pages, especially when checking referrers.
Here is a screenshot of checking my referrers with the Link Highlighter Script:

The tutorial on how to make the script is here.
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