Gecko:Debugging Tools

Frame Tree Dump

<bz> for a frame dump, you can use the layout debugger, or... if you're in a debugger and want to examine the tree, you can do

def frametree
  set $r = ($arg0)->PresContext()->GetPresShell()->GetRootFrame()
  if ($r)
    call ((class nsIFrameDebug*)(class ViewportFrame*)$r)->List(stderr, 2)
  end
end

<bz> That should work when called on any nsIFrame to dump the tree it belongs to

Reflow Logs

See [Debugging Frame Reflow]