In Chrome developer tools' JavaScript console as well as in Firebug's we can access the result of the last evaluated expression via $_.
Is there a way to access the second/third/... last result? I am interested in answers for both Chrome DevTools and Firebug.
The simple and unfortunate answer is no, there is no way to access the value of the second/third/... last evaluated expression.
See Chrome's Command Line API documentation as well as Firebug's documentation.
Only the inspected elements have a history like that. That means, you can access the second-last inspected element via $1, the third-last one via $2 and so on.