I read the other thread about SA disappearing in Firefox. http://community.mcafee.com/showthread.php?t=223867
I am experiencing the same problem but wasn't sure that the info supplied in that thread was something I should try also.
Installed SA and it works but when I reboot it is gone. I tried the one idea of updating my SA in my Internet Explorer 6 and SA came back but rebooting it is gone again in Firefox.
XP PRO SP3 current patches as of today 9/22/08
Site Advisor 26.6 (In add/remove programs says version 2.8.277)
Firefox 126.96.36.199 Extensions: NoScript 188.8.131.52, AdblockPlus 0.7.5.5, DOM inspector 184.108.40.206, Googletoolbar 3.1.20080730W
Zone Alarm FW Free 5.5.094
AVG Free 8.0.169
I also use Spywareblaster, Spybot Search and Destroy w/o teatimer, Malwarebytes all free versions and used on call none running resident except Spybot I use immunize.
I really like SA and find invaluable and miss it dearly. Any assistance greatly appreciated.