This is what you're using to surf the Web:

 Browser Info
 

How to interpret this stuff:

The info in parentheses under "Browser Info" is what's important.

MSIE = Microsoft Internet Explorer
Example:  Mozilla/4.0 (compatible; MSIE 5.5; Windows 98)
This is Internet Explorer version 5.5 running under Windows 98 (or Me).

"Mozilla" + number = Netscape Navigator
Example:   Mozilla/4.7 [en] (Win98; I)
This is Netscape Navigator version 4.7 running under Windows 98.

Confusingly, browsers identify themselves as some flavor of "Mozilla," but this doesn't necessarily mean they're a Netscape browser.
AOL users will be running some version of Explorer. The browser ID line will look something like this:
Mozilla/4.0 (compatible; MSIE 5.5; AOL 6.0; Windows 95)
This reads: Mozilla class browser, version 4-compatible, Internet Explorer version 5.5 built into AOL version 6 running under Windows 95.
If you see another browser such as Opera or iCab, chances are you installed it yourself   ;-).

What to do now

If you have any questions or comments about all this gobbledygook, feel free to email the webmaster.

Happy surfing!