Anti-Phishing Domain Advisor
Full user review
On the page it takes you to it does give you advice on how to uninstall it.
I will be doing an image search and quite successfully find the image I want but then when I try and follow it to a larger image I am told that the website doesn't exist even though I have got an image from it on my screen. On top of this it then offers to let me search again with a Yahoo box, despite the fact that I use Google and was doing the search with Google.
I am not sure where this came from. I think it may have been the alarm clock mentioned by another reviewer. I thought this sort of thing was done by Chrome anyway. I always used to receive warnings about dodgy sites but was not blocked from looking at sites that have pictures of the Queen or similar on.