This problem was initially reported as 6872713 and will be later on properly fixed by decoupling 
install and deploy code.

However, quick intermediate solution may help to save as 6+Mb or virtual memory 
(in case of plugin lib is loaded into both browser process space and java process space) 
as well as some time on startup (msi.dll is not generally loaded into memory as it only needed on startup).
Webstart applications are aslo affected.
(to verify use process explorer or listdlls from systinternals.com)