said by upieper:The browser process and any other processes started from the sandboxed browser will be sandboxed.
If you enter programs under Restrictions > Start/Run Access then these program are not allowed to run at all
Upieper, if you look at the wording of the dialog, it's au contraire: only the programs you list are allowed to run; i.e., it's a whitelist, not a blacklist. (Although if nothing is listed, anything can run.)
Flash cookies go into the sandbox, where they can be read by anything that's part of the current browser process,* it seems.
*Edit: Or running in that sandbox.