Harley Waverider

I went to a sandbox and was pummeled with thousands of objects sent to me asking if I was a **bleep**got and trying to send me to some website. I managed to locate and report the offending object, but now I have a massive amount of little boxes left that pop up a blue box asking me if I'm a **bleep**got and trying to send me to the website. I can't possibly click each one and pick "close". How can I get rid of them all ar once?