Os x firewall and little snitch firewall running at same time , can they collide or lead to system crash ?

os x firewall is very good , but it does not manage outgoing connections !
if running the little snitch and the built in firewall at the same time , can i ensure security without system crash (os x yosemite ) ????
thanks

I normally advise against Little Snitch: it delves very deep in the OS core so it does not add to security and can more easily lead to security issues than without it.
You must be a power user with special interests to use such a software.
Lex

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