Are you talking about the process in Activity Monitor? It's just Safari's rendering worker process, just like Chrome's "Google Chrome Worker" processes. What it

Are you talking about the process in Activity Monitor? It's just Safari's rendering worker process, just like Chrome's "Google Chrome Worker" processes. What it was "doing" is rendering pages and running javascript. If it gets out of control, CPU or memory-wise, it is almost certainly a misbehaving tab.