Firefox is an excellent tool for SEO. I can't imagine working without it. Here are the top 10 Firefox SEO extensions that I use every day:

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.

There is a great extension for Firefox called StumbleUpon. It adds a toolbar to your browser that looks like this:

After you install the toolbar, you will be asked to register at StumbleUpon.com. To discover new web sites, just click the Stumble! button, and a new interesting web site will be loaded in the browser. If you like the site, click on the thumbs up; if not, click on the thumbs down.

There are many ways to save web pages and web sites for offline viewing. These methods will work on Linux, Windows and/or Mac OS X. These tools will save entire web pages and web sites. If you are looking for a way to take screenshots, try this page instead.

It has been over a year since I posted my first reviews of Firefox extensions. Here is an update on some of my favorite Firefox extensions.

There is a developers extension for Firefox called DevBoi that gives easy access to documentation for Ruby on Rails, Ruby, PHP, CSS, JavaScript and HTML, among others. I first discovered it through the blog at quotedprintable.com.

Here is a screenshot of browsing Ruby on Rails classes in Firefox with the DevBoi extension:

One of my favorite Firefox extensions for web design is the HTML Validator extension. I've mentioned it about a year ago on my Firefox web design extensions page, but this post covers it in more detail.