Lately, my Firefox often not responding after being used for some time. It's the computer in my office which is behind the proxy. I thought by upgrading to 18.0.1, which fixed several problems with proxy the problem should go away, but it seems that the problem is not within the Firefox itself or probably the real problem hasn't been fixed yet.
The symptoms is that the system will not connect to any websites after being used for some time (usually like 10-15 minutes) until it has been restarted.
Any ideas on solving this problem? It's kinda annoying to have this problem as i have to restart the browser and lost all of it's content and i have to reload it again.