Portable firefox bug - jumpy

Hi,

Love the product, thanks for the work on it. Just installed it and am looking forward to avoiding using IE now at school. When I ran it from my laptop though there was a periodic bug that would occur. Some pages periodically would be jumpy, as in when it loads the initial google home page the whole page would be jumping up and down about 3 mm in either direction. It comes and goes but happens on every 10th page. Sometimes a refresh gets rid of it, sometimes not. Doesn't seem to be related to the specific page, PortableApps.com did it a couple of times too.
Also, it would be helpful to have on the extensions page of PortableApps which dll's you need to copy over to the portable app's directory to install the top 10 extensions. i.e. addblock, weatherfox, tab browsing preference.

Again, thanks a lot for the work

Aaron