Safety of using external USB mouse?

[ggg...@gmail.com]

I have noticed it is not recommended that we use an external USB Keyboard because it might have been - well not safe.  

I am not sure about using an USB Mouse, and whether that answer is for Qubes OS only, or just that the USB mouse never has firmware?

[awokd]

ggg...@gmail.com:

I think some of the same concerns apply to USB mice, but they are a
little less sensitive because you don't type in passwords with them.
Many (all?) USB mice have firmware which could be compromised.

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