I get a "not responding" message when changing websites or webpages.
When I change to a different web site, or go to a different page withing a website very often in the upper left corner of my screen I see the message "Firefox is not responding" and my computer freezes up for a few seconds. Sometimes it freezes up for 30 seconds. This is extremely annoying. This happens quite frequently. I have tried re-installing Firefox, but the problem is still there.