Unwanted navigator-like input field at the top of each editor tab in eclipse debugger perspective

I'm not sure what I have pressed when debugging, but now all开发者_C百科 my editor tabs have additional input field at the top which shows something like pkg->class->method. Thankfully, this navigation input is not present in Java perspective. How can I nuke this thingy?

A screenshot would be helpful.

If by the "additional input field" you mean the breadcrumb, then there's an option to show/hide it on the tool bar: