Every now and again I'll get this pop-up (not an actual web-page popup, but a system pop-up coming from Safari) saying on the title bar "http://eo.lernu.net", then telling me either the page loading (for example, "http://eo.lernu.net/komunikado/forumo/forumo.php?f..."), or in-page content (e.g. google ads __ 3 or some cryptic name like that).

Could this be a lernu issue or is my computer just being creative? It hasn't done this before, doesn't do it for other websites, and it wasn't happening on the uni Windows 7 PCs using IE (whatever the latest is) earlier today.

It's not really like an error either since everything loads correctly, it's like it's giving me a system pop-up box to tell me the page's URL...