stack_depth will not work with WWW::Mechanize::Firefox?

Firefox doesn't have a stack_depth option, and WWW::Mechanize::Firefox simply lets firefox keep the history

See https://developer.mozilla.org/en-US/docs/DOM/Manipulating_the_browser_history

You could try ->eval in some javascript emulating the feature of stack_depth,

But , since I don't write spiders, I find that going ->back works for me