I think I'll reopen this one since I can reproduce using a few microsoft websites (that without the pref would hijack the back button) and the steps from comment 0. eg of websites: 1. https://answers.microsoft.com/en-us/msoffice/forum/all/account-locked-for-weeks-no-reasonnotice-and-no/04bc4b41-a70d-4b5a-b494- 2. https://support.microsoft.com/en-us/topic/windows-10-update-assistant-3550dfb2-a015-7765-12ea-fba2ac36fb3f 3. https://support.microsoft.com/en-us/windows/manage-background-activity-for-apps-in-windows-4f32dffe-b97c-40e8-a790-3ca10373a1ef An interesting thing is that if the above websites are opened in the same tab, the back button will be hijacked right at the start, although if opened in different tabs the back button will work from the start.
Bug 1914555 Comment 5 Edit History
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I think I'll reopen this one since I can reproduce using a few microsoft websites (that without the pref would hijack the back button) and the rest of the steps from comment 0. eg of websites: 1. https://answers.microsoft.com/en-us/msoffice/forum/all/account-locked-for-weeks-no-reasonnotice-and-no/04bc4b41-a70d-4b5a-b494- 2. https://support.microsoft.com/en-us/topic/windows-10-update-assistant-3550dfb2-a015-7765-12ea-fba2ac36fb3f 3. https://support.microsoft.com/en-us/windows/manage-background-activity-for-apps-in-windows-4f32dffe-b97c-40e8-a790-3ca10373a1ef An interesting thing is that if the above websites are opened in the same tab, the back button will be hijacked right at the start, although if opened in different tabs the back button will work from the start.