When the statusbar is hidden, the resizer in the bottom of the window goes with it. In bug 489303, I added the resizer to the intersection where the page’s scrollbars appear. This is trickier than it sounds as it involves making the page’s resizer appear even though it resizes the window.
Arrow panels used for notifcations are almost complete. Only a few minor appearance related fixes are needed to get the border and shadows correct. These are shown in this image. I am currently testing these fixes.
I spent a lot of time working on bug 522956, trying to get it to work without causing tests to fail. Unfortunately, dealing with window handling on Linux is difficult due to issues handling asynchronous operations properly. I worked out a fix for the tests that were failing.