Adblock Plus

I remember a while ago ABP blocked all ads for me automatically. Something weird happened to my firefox (It reset or something) and now it doesn't block ads automatically. How would I go about blocking ads automatically?

Thanks in advanced

You may have lost your filter subscription. You can readd it here: http://adblockplus.org/en/subscriptions

And FYI:Adblock Plus doesn't block anything without filters or filter subscriptions.