Run firefox in sandbox

I need some help. I am able to run firefox in sandbox but when i need to use flash the flash container keeps crashing and reviving the second process again and again. Am i doing something wrong or a setting/hip rule i need to add? I have hips in safe mode and to create rules for safe application.

Appreciate any help i can get.

EDIT: Also any way to disallow an application to access protected files or at least a notification about it so i can block?