Infra no need to complie any things in your system. Do not install or remove anything on your system manually, this causes dependancy problems. I guess bluetooth will be detected properly, mine was.
You need to turn the swap on using the swapon command.
Are you sure firefox wasn't installed, cos Ubuntu packs firefox with it. The packaging and icons seem different.
Anyways, you can install or remove any programs by selecting or deselecting them from synaptic. Or you can use apt-get. Have a look here at how to use
apt-get in Ubuntu/Kubuntu.
You can have a look at
ubuntu guide itself for answers on how to use the system, it will be similar for Kubuntu, too.