Text fields in Portlet forms not editable

Apply given patch on "framework" or just add an include-form with text field on one of the ExemplePortalPage.

https://localhost:8443/example/control/showPortalPage?portalPageId=10020&parentPortalPageId=EXAMPLE

On Firefox browser, the form fileds are not editable, I cannot write anything in the field, moreover, I cannot put the mouse cursor in.

It works on Chromium browser.