If you set about:newtab as your homepage, it comes up blank. This also means that if you just have the new tab page displayed and the browser restarts (from a new install or add-on install), the browser comes up blank.
WFM. Can you give exact steps to reproduce? Does this happen with a new profile?
I created a brand new profile. I went to preferences. Changed Homepage to about:newtab Saved Closed and reopened. I got a blank page (I'm still getting it on Windows). I didn't test nightly, so it might be fixed there. That's why I reported against 22.
Mass-move to Firefox::New Tab Page. Filter on new-tab-page-component.
I tested this on Firefox 31 (on Linux) using a clean profile, and I cannot reproduce it. Mike, are you still experiencing this issue?
Seems to work now.