I have Mozilla 1.1b and Zonealarm pro V. 3 and tehre are problme with the program Privacy option in On. Apparently the problem was solved, like appears in http://bugzilla.mozilla.org/show_bug.cgi?id=139053, but truly it is not this way it. Usually in the middle of a load process, it appears to the left below corner the sentence Stopped. Only if you put the program Control privacy option in Off, in zone Alarm Pro, everything is OK again.
*** This bug has been marked as a duplicate of 164045 ***