I've been running Firefox 3.0.3 under Vista since it was released quite OK. In the last couple of days, possibly since the latest MS patches, I've been getting problems. After 15-20 minutes running time, no pages will load. The internet connection is fine as Outlook and Internet Explorer continue to work.
If I shut down Firefox and try to restart, it says Firefox is already running. If I try to kill it in task manager, it continues to run. Logging off does not stop the process. The only thing I can do is restart. I have reinstalled Firefox, without any add ons, but that makes no difference.
Possibly just a coincidence, but when I close down the system, it now takes 2-3 minutes before any running processes are stopped, whereas before these problems began, the process would begin to close almost immediately. I don't know if this is a Windows update problem or a Firefox problem
It may be something else completely. I checked the Firefox forum and it mentioned possible conflicts with Zonealarm, which I am running. I then checked the Zonealarm forum and found someone with the same problem including the long shutdown. I had forgotten that I had also updated Zonealarm this week as a result of a security update notification. The moderator suggested the ZA database could be corrupted and advised a re-set. That has cured the long shutdown and I am waiting to see if Firefox stays connected to the internet over a period of time.