Go to

http://www.wweshop.com/Product_detail.asp?cat=cat-newreleases&productId=01-08706

And click on the image for the larger version. The pop-up will appear and so does the JavaScript ErrorConsole.

Happened in 1.1a3c_1.8.1.3.

This is definitely no K-Meleon bug.

The code of the related links looks like this:

a href="javascript:" onclick="window.open(...)"

This means that, when you click the link, the JavaScript code specified in the onclick attribute is executed (which opens a popup window here). But also the url specified in the href attribute is opened. For most browsers, "javascript:" is no valid url and will be ignored, but for Gecko browsers (not only K-Meleon, but also SeaMonkey and Firefox) this is the url of the built in JavaScript Console.

I guess, that's not in the intention of the webmaster. Especially, since this site contains a lot of errors. So, maybe tell them to correct that.

The link code must be either something like this:
a href="javascript:window.open(...)"

or something like this:
a href="#" onclick="window.open(...)"