If you look at the source code you will find the module which I am talking about
https://github.com/henkaku/VitaShell
I guess this webkit exploit is a kernel one, so maybe this will be the golden firmware.
I was looking at the source code of the moleculeShell and I find something interesting, to install the VPK files they call the package instaler using the function "sceSysmoduleLoadModuleInternal(SCE_SYSMODULE_PROMOTER_UTIL);". So if some one could reverse engineering this module maybe we can...