For QA: there are some potential reproduction steps listed in https://bugzilla.mozilla.org/show_bug.cgi?id=1853107#c31, but this bug does seem generally hard to test. Please just give it your best shot to prove it's not continue, and a general smoke test of creating tabs, switching tabs, and tabs restoring correctly when backgrounded would very helpful. Thanks!
Bug 1853107 Comment 51 Edit History
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For QA: there are some potential reproduction steps listed in https://bugzilla.mozilla.org/show_bug.cgi?id=1853107#c31, but this bug does seem generally hard to test. Please just give it your best shot to prove it's been fixed, and a general smoke test of creating tabs, switching tabs, and tabs restoring correctly when the app comes back to the foreground would very helpful. Thanks!