I think I have found the solution to the problem of FF crashing. One needs to disable the AVG Safe Search extension via Options > Manage Add-Ons. It is not crashing now. Of course one needs to also check as to whether your plug-ins are up to date by visiting https://www.mozilla.org/en-US/plugincheck/. I am using Windows XP SP2 Professional version 2002, MSI 7207 motherboard and AMD Athlon 64 3200+ processor. Now I hope my favorite FF browser continues to serve me as earlier. I have version 7.0.1 installed and running.
Do not ever be taken in or dream of becoming a home-based medical transcriber fresh after training. At least not until you have had 2-3 years full-time office-based experience in multispecialties.