Firefox problem using up/down keys on keyboard

I’m using Vaadin 7.7 table in my application.

When I try to move up/down using keyboard keys it doesn’t work in Firefox 66.0.1.

Using Chrome it works well.

The same happens in Tree class.

Is it Vaadin bug or a Firefox bug ?

How can I solve it ?

I’m using Vaadin 7.7.16

Tks

Yes, it is not just Vaadin 7, but Vaadin 8 as well. There is more discussion about this in GitHub here:

https://github.com/vaadin/framework/issues/11502

Tks for infos but I still don’t understand how solve the problem.

Should I migrate to the last 7 version ?

Is there a workaround I can implement in my code ?
Tks