Keyboard input not working after InputField was in use, only in Firefox

[Daniel4144]

After interacting with an InputField (and then disabling the Inputfield), inputs through keyboard are not working anymore.
For example before interacting with the InputField I am able to move a player object via WASD, then I open a menu with an InputField - the InputField is working normally - then I close the Menu. Now I cannot control the player anymore with WASD. I also cannot open the menu again with TAB, TAB cycles through the Browsers menubar elements.
I found this in Firefox, in Chrome everything seems to be fine.

I am using Unity 2021.3.11f1