Good to know that the shortcuts for Keys appeared as normal by closing and re-opening the Firefox browser. Sometime, the broken cookies, cahce,. can causes the issue while trying to access the login page from quick access in firefox.
Addition, you can also try disabling the browser extensions i.e ABP addons or other addons that could helps to solve the issue on your end. If issue remain, we would like you to reach our F-secure support for further investigation is needed.
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