Orca is not an add-on to Firefox, but is a browser in itself that uses the Mozilla Gecko engine, which is also used by Firefox. I don't know whether Orca includes the code for the Gecko engine or if it uses the engine as installed with Firefox, but I am using Firefox 4. Once again, this has nothing whatsoever to do with NIS AntiSpam, as I'm using AntiSpam with Outlook Express, which is not implemented in a browser. If Outlook Express uses any components of a brower engine at all, it would be the Trident engine, which is used by Internet Explorer. I have IE8 installed on my computer, and all of the available updates and security patches for both IE8 and XP SP3 are installed.
My system dual-boots XP SP3 and Win 7, but I'm still in the process of migrating to 7, and I'm still sending and receiving email only in Outlook Express 6 on XP. My system has a 2.8 GHz, quad-core Intel Q9400 with a total of 8 GB of RAM installed, so speed, power, and available resources should not be a problem.CPU utilization averages around 17%, RAM load averages around 25%, and responsiveness rarely falls below 100%. I monitor all of these parameters on a regular basis.
With regard to the RAM, XP uses what it can of the first 4 GB, and the second 4 GB is used as a RAMdisk. I am not running any other security software that could interfere in any way with NIS, .
I've tried quite a few other spam filters in the past, and while some of them were even more intrusive and annoying than Norton AntiSpam, there were some that were able to do their job quite well while remaining relatively unobtrusive. I purchased NIS 2011 because I saw a number of reviews that indicated it was, overall, the best product of its type currently available. I was specifically looking for a dependable security suite that didn't nag me to death and didn't put much load on the computer during normal operation. For the most part, NIS lives up to the reviews, but the AntiSpam seems to be quite poorly implemented. If necessary, I'll turn it off and go back to a standalone spam filter, but I'd rather be able to use all the features of an integrated security suite. As it stands, I don't think I'll be able to put up with Norton AntiSpam.
My comments here were intended not to solicit help for problems I'm experiencing but to provide feedback to Symantec regarding what I consider to be defects and/or shortcomings in their software. This should be taken as constructive criticism, but it seems like that isn't welcome in this community.