It is not garden/plant related and it locks up my browser and I always have to close out. It seems like I get it when I am trying to work in the database. I have this problem with all ads that have those scrolling windows.

Screen shot:

I don't know the URL for that ad but it's probably "cimzia.com" and I added that to the block list. Within an hour or two, that ad should stop showing altogether.

Thank you Dave! Will let you know if I have trouble with any other ads of that type.