How to get rid of something from Safari link?

I may think that this file is not in the Safari extension folder. I downloaded it a long time ago, and I do not remember the name of that file. I really want to delete it permanently.

Here is the example of two pink horses that says "Go to "http:..." (See red arrows). I am tired to see it everyday.

Safari 7.0.2
OS 10.9.2

Finally, it disappeared for good. Thank you.