You don't tell us what version you upgraded from and to.

If you review the Changes file, there were heavy changes in v0.69, which now relies heavily on a set of events, and your code eliminates two of the three required events. I would assume that that is part of the problem.

In reply to Re: WWW::Mechanize::Firefox stops after $mech->get() by Corion
in thread [solved] WWW::Mechanize::Firefox stops after $mech->get() by ground0

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