apparent acc bug in firefox

hi gang,

I have been trying to resolve an issue with custom elements developed using
the polymer library.

It appears that Firefox exposes a mousedown event listener as a click
default action in acc layer.

This results in non interactive custom elements being announced as
clickable.

can you have a look at this message to the polymer list to see if you can
shed any light?
https://groups.google.com/d/msg/polymer-dev/4ObaAH29S08/NiBUPOmfiawJ

correct link to example: http://jsbin.com/vegam/1/quiet

thanks!
--

Regards

SteveF
HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>