Hi!
I reported a bug to Mozilla, but the guy who answered didn't appear to care much. He suggested I inform you about the problem. I think both teams should look for a fix.
A new feature from Firefox is a centralized page to control permissions of a website, like block or accept a cookie from a site. This new feature is the Nightly version of Firefox for a couple of days. You must type "about:permissions" in the url bar.
When you hit enter, Firefox will load the complete list of websites you have visited, or block something from it, i don't really know exactly.
But the immunization feature from Spybot turns the user experience really bad, because it adds thousand of websites to the list (probably because it blocked something, like cookie), and that makes Firefox hang for minutes.
Sorry for my poor english.
I registered myself here on the forum just to report this problem, that I think it's very important because it's going to affect millions of users that use both programs. Luckily, first Firefox version with this feature is 6.0, which still is 5 months away from the big public.