Bug and Dragon

If you are even not a fan of Opera or in case Opera is your magic powerhorse, you might be interested to know Opera alfa-released its own Developer Tools called Opera Dragonfly, which allows debug JavaScript, inspect CSS, DOM, and view any errors.

I don't know what the most popular browser SEO Freelancers use, but Firefox maniacs (as me) love SEO Firefox plugins, especially beloved Firebug - a Firefox important Web Developers Add-on (created by Joe Hewitt in 2006), which is now free and open source, and available for IE, Opera and Safari.

Sooth to say, I never heard of any Web Developer with Internet Explorer Developer Toolbar. But you?