Most web browsers display their version number on the window that opens while they are loading, but if you miss it there you can do the following:

If you are using Netscape on Windows, click on the "Help" menu, then "About Netscape..." and a screen will open that will say which version you have on the top line. If you use Internet Explorer, click on the "Help" menu, then "About Internet Explorer" and a screen will open that will tell you the version.

On a Macintosh running Mac OS 9 or earlier and running Netscape, click on the Apple menu, then "About Netscape..." and a screen will open that will say which version you have on the top line. If you use Internet Explorer, click on the Apple menu, then "About Internet Explorer..." and a screen will open that will tell you the version.

On a Macintosh running Mac OS X 10.0 or later and running Netscape, click on the "Netscape" menu, then "About Netscape..." and a screen will open that will say which version you have on the top line. If you use Internet Explorer click on the "Explorer" menu, then "About Internet Explorer..." and a screen will open that will tell you the version.

If you aren't running either Netscape or Internet Explorer, you can usually follow fairly closely the steps outlined above for your operating system.