That is Googleleads. It looks at you and what you do on the net, then targets you with adds IT thinks are appropreate. If you got a Disney Resort add I would expect sometime resently you (or someone on that computer) looked up vacation/travel stuff...
BTW: If you see a known anti add on a firearms site. Click on it, open it up, then go back to what you were doing. It will cost the anti's money, and will support your local firearm site. They have to pay per view.