What's Firefox, you ask? It's an increasingly-popular alternative to Microsoft's Internet Explorer (IE), the most popular Web browser on Windows-based personal computers.
What's important is that things don't always look/act the same in Firefox as in IE. That includes your Web site.
Have you taken a close look at your Web site using Firefox? Do you know (from your Web server logs) what percentage of visitors you might be turning away from your site because it doesn't look or work right in Firefox?
It might be good to check these things, since according to MarketingSherpa.com, as much as 35% of your site traffic might be using Firefox. The article also points out other benefits to a standards-based site design, like improved search engine visibility. (Note: this article is free until December 9th, so print a copy for later reference).
(The Winery Web Site Report evaluates basic browser compatibilty using IE (on Windows) and Safari (on Macintosh), as these browsers are pre-installed. For wineries purchasing our report, we also check Firefox compatibility, as we are in the process of adding Firefox behavior as an evaluation criteria. It just takes time to check over 2,200 winery Web sites with another browser.)