There is an RPM for Firefox 3.6.4 for CentOS. It prevents issues with SELinux which arose when version 3.6.3 was installed as described in the ‘OLD POST’ method and then upgraded to 3.6.4.
That said, 3.6.6 is now out, however, I don’t think there’s an RPM for CentOS, yet.
— OLD POST —
Last night, Google refused my search requests, claiming that something was making too many requests. Since it was late, I shut off the laptop. This morning, I Googled for information and found http://www.digitalspy.com/forums/showthread.php?p=40231435, which is exactly what happened to me. Next I found http://www.fortiguard.com/encyclopedia/vulnerability/firefox.centos.security.update.cesa-2010-0112.html, which led me to http://www.mozilla.com/en-US/products/download.html.
After a bit more surfing, I landed in http://www.esecurityplanet.com/features/article.php/3881621/Security-Firm-Finds-Gaps-in-Popular-AV-Software.htm.
I downloaded FireFox 3.6.3 to my desktop and untarred it. I tried to install it ‘properly’ such that all the users on the laptop would be able to use it, but that didn’t work out. Eventually, I used the package manager to remove the old version of Firefox (3.0.18), changed into the firefox directory, ran updater, then ./run-mozilla.sh ./firefox and it worked. It’s not ideal, but it is running. There’s only one user on this laptop, it’s me.
Several days later I had the same problem. On a hunch, I removed a FireFox toolbar that was displaying the Google page rank. The next response from Google asked me to enter a CAPTCHA code, and then, everything was fine.