User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:39.0) Gecko/20100101 Firefox/39.0 Build ID: 20150324030207 Steps to reproduce: Ever since the 2015-03-25 Night build, when loading up Nightly, the following happens: - On the initial paint, the chrome is shown with a New Tab and no content rendered - After that, the window gets stuck like this and doesn't repaint. - If you resize the window, the window does get repainted again once. - After doing that, I can see that all of my tabs from my previous session have in fact load up, but still aren't being repainted. They're just stuck as a static image.

Forgot to mention this happens regardless of whether e10s is enabled or disabled.

For me too. Windows 10 x64 build 10041 german (de-de) Firefox Nightly x64 build 2015-03-26 (en-us) Tested with a new profile (firefox.exe -no-remote -P "nightly64")

I see similar blank screen behavior this on Windows 7 (but not in Safe Mode) but not Linux.