You know which browser I'm using.

Every request a browser makes to a web server includes information about the browser itself: name, version, etc. This information is sent in the "User-Agent" header and can look something like this (for Internet Explorer): "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)". In fact there's a ton of documented User-Agent strings out there describing pretty much everybody and their mother.

But guess what? For human-viewable web pages, the entire User-Agent database can be reasonably reduced to a subset of, oh I don't know, five?

So for the love of all that is good, please tailor your website to the major browsers. When I'm visiting your site to download an application and I'm using Firefox, show me the steps to install using Firefox. It's not that hard, and it makes a big difference in the usability of your site.

Don't just show me this image regardless of my browser, because you know which browser I'm using.