This is a great ad blocker, but for over a month every time I open Firefox, AdBlocker Ultimate opens a tab asking for money. This would have been fine if it only lasted a week or so, but continuing for over a month is simply begging. I refuse to be forced to to pay money for a supposedly free add-on to get rid of an annoying plea for money. If this continues into June, I will find another ad blocker and will no longer recommend this add-on.