Notice how much faster webpages load.
Apparently, load times are heavily degraded with a blacklist, because Adblock has to check through it's entire list for everything you load.
I noticed a major increase in Firefox's speed right away.
The ads may be back, but at least my speed is 2-3x faster.
Worth the trade off in my opinion.
Also, if you have "Spyware Blaster", remove the blacklist of websites it places. Firefox should also benefit in speed from that too.