main frame - has 1 onunload handler(s)
main frame - has 1 onunload handler(s)
main frame - has 1 onunload handler(s)
main frame - has 1 onunload handler(s)
main frame - has 1 onunload handler(s)

FAIL Multiple history traversals from the same task assert_array_equals: Pages opened during history navigation property 1, expected 2 but got 3