The app mode does not handle external links correctly. I see this problem on both G+ and to a lesser extent on Facebook.

Steps to reproduce:
1. Create a web app from a page.
2. Start web app.
3. Click on an external link.

Expected result:
Link should be opened in a normal web browser window.

Actual result:
Sometimes (basically always on G+) the link is somehow handled incorrectly and opened in the application window.

This behavior is made worse by an additional problem: The history is not functional so it is not possible to go back to the application web page.