Safari on my system running 10.5.5 develops a huge memory leak over time. I haven't found widespread reports of current memory leaks in Safari. Are others experiencing problems? If not, how can I go about figuring out whats causing the problem on my system? Safari is currently at version 3.2.1. I don't normally close down Safari. It tends to be up and running all the time. I sometimes have many tabs open, up to 10. I view videos, mostly flash. I use Safari for RSS feeds. I have safariblock installed to block ads. Generally while I use Safari, memory usage slowly creeps up until my system starts thrashing more and more and eventually I bring up Activity Monitor to see that Safari is consuming the entire machine. I'm running Leopard 10.5.5, Safari 3.2.1 on a Macbook with 2GB RAM. When Safari first starts I see memory usage of RSIZE 60MB, VSIZE 988MB. But over time, it grows. The other day when my system reached its limit, RSIZE was over 1GB and VSIZE was 4.5GB! It really was using up at least 2GB of virtual memory. The "swap used" field dropped by 2GB when I stopped Safari. Any suggestions appreciated. I'm being forced into using Firefox which I don't like as much. Firefox is not exhibiting memory leaks on my system.