It will not let you configure your own editor to replace view source.
Afaik, it's not possible atm.
It makes you click every instance of every Java Applet before you view it.
If you mean that you need to click on a "play button" for the aaplet to run, then you need to disable off-road mode (or turbo) and/or "click to play 9or plugins on demand)".
It thinks Java Web Start is not installed.
Do you have Java installed?
It sometimes refuses to load documents from local hard disk.
Any kind of doccuments?