Can´t select Category Field in Firefox

Can´t select Category Field in Firefox

Can´t select Category Field in Firefox.
 
We was informed that this bug was fixed in recent 8 release. But wasn´t.
 
See attached the issue.
 
Best Regards,
 
Obs.: This issue does not occurs in IE or Chrome.
 
Request ID :##6654763##
(obs.: I sent a reply to last E-mail about this issue, reporting that the bug was not fixed, and I received a new ticket number: ##6669915##)

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