Why do Chrome and Firefox updates so often happen on the same day?

Why do Chrome and Firefox updates so often happen on the same day?

I use both Google Chrome and Mozilla Firefox browsers.

I notice that when one does a software update the other does an update on the same day, or maybe one day later.

Since they are maintained by separate organizations, I wonder why their updates seem to be so perfectly synchronized.

Does anyone know why that is?

Maybe someone who works in IT?

Why do Chrome and Firefox updates so often happen on the same day?
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