I think I'm having the same issue. A banner recently showed up under the tabs in Safari. It looks like this: on the left, there is an 'x' that looks like the "exit" 'x' but it doesn't work. To the right of that, there is the icon for an ap. When I had the ap, there was a button to launch the ap. Thinking it would help, I deleted the ap. The banner didn't go away but now there is a button to "view" the ap in the ap store.
The (same) banner goes on every page in Safari. I get it with every new page (tab). This started after I updated to iOS7 in case that matters.
Basically, the two things I tried was to tap or press the 'x', and deleting the ap.
Did I miss something (I'm a noobie)?
Any help would be greatly appreciated - it's ready annoying!
Thanks!