campd/fxdt-adapters — pull request #15 by captainbrosset (2014-09-11 20:04:10+00:00)
Title: Issue #13 - Inspector breaks after page navigation

This sort of helps a little bit.
The downside is that as long as the new frame isn't totally loaded, the markup-view doesn't appear (which btw is the same on FirefoxDevTools with Firefox).
The upside is that it kind of fixes the problem by stopping what I think is a race condition from happening.