状态栏。。。去了又来，最新方向chrome那样

其实觉得他们怎么改一直都比不上Griever的脚本好看、方便实用。

看这次结果怎样。

Bug 603777 – Show loading state in right side of location bar (à la link hover preview)
https://bugzilla.mozilla.org/show_bug.cgi?id=603777#c32

Based on feedback from the Mozilla module owner and others, we may be switching
the spec to use a Chrome-like transient window that appears over content at the
bottom left. I'll be working on that today, and may end up marking this bug a
"Future"