Images Not Appearing On Site; Accessible Directly Through Url

I have an HTML site that is using several images that do not load in Chrome [edit: and in some people's Firefoxes, not mine]. Using Chrome inspector I can see that they are given

Solution 1:

The non-loading images are named ad-something..

That means you have an ad-blocker (browser plugin) that is blocking those images thinking that they are advertisements..

Solution 2:

The host uses hotlink prevention, i.e. they're blocking the usage of their images from outside their own domain.