Youtube History problem help?!?

D

Member
I was on Facebook and a friend trying to be funny sent me an inappropriate video,I was however not on my Youtube account but my brother-in-laws on his computer. I deleted the youtube and browser (mozila) history but when you go on the quick menu it still shows the picture of the videos and all the history is there. 'But when you click it the history it is cleared. I want to get rid of the picture to save from a embarrasing moment. I have tried watching other videos but the same damn video pops up!
 
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