This is a PSA-style post on a couple of recent issues with Nightly builds of Firefox on Android:

Pages aren’t rendered when you haven’t used Firefox for a while, the about:home content ‘sticks’ instead. This is bug 863803, present in builds from April 18th. The workaround is to close and restart Firefox. On ICS or higher you can swipe it away in the recent apps list, otherwise force close the app

Nightly doesn’t update any more and is stuck on the build from April 10th (fixed for later builds by bug 860454). If you see ‘(2013-04-10)’ after loading about:firefox, then install a new copy of Nightly from nightly.mozilla.org