Problem with tzdata rule history in JavaScript running on top of Gecko

[Paul Eggert]

José Miguel Parrella Romero <joseparrella at gmail.com> writes:

> I narrowed the problem to JavaScript applications running on Mozilla
> after testing CLI-based calendars and other calendars based on glibc,
> and finally testing with Konqueror with successful results. This problem
> has been already reported on Mozilla's Bugzilla.

All I can think of is that the Mozilla code somehow didn't "like" a
half-hour transition of standard time.  It is a bit unusual.

Which Mozilla bug number is that?  Do you have a URL?