memory leak ?

Hi,
First I have to say I've been a loyal netvibes user for now more than a year and I find it simply amazing, now I can't even go on the web without it !

However, I have a small problem that's been causing me a lot of trouble... At first I though it was caused by my firefox which was starting to get full of addons but now that I changed my computer and had to reinstall everything, I realised it was still happening even without anything added to firefox, and it's happening only when I'm on netvibes.

As I am writing this, I only have one other tab opened and it's showing one of my netvibes tab. I also have my task manager opened and I can see firefox's memory usage rising constantly. As you can see in the screenshot, memory usage for firefox is abnormally high, and I don't know what's causing this...

here is a link to my netvibes page http://www.netvibes.com/twe4k#BUZZ you will probably be able to reproduce the problem...

I hope you can help me fix this because it's now the only thing separating netvibes from perfection for me !

thanks a lot for your help.