If you refresh the page several times there will be an error in the console in DOMTree.js:286 where undefined variable flowKey is used. It should be flowId.
<rdar://problem/15282879>
Created attachment 214786 [details] Patch V1
Comment on attachment 214786 [details] Patch V1 r=me
Comment on attachment 214786 [details] Patch V1 Clearing flags on attachment: 214786 Committed r157762: <http://trac.webkit.org/changeset/157762>
All reviewed patches have been landed. Closing bug.