If you did I think you would have definitely noticed, as it would almost certainly taken over as the default browser and not Firefox in your first image.
I have an inline translating app in, Firefox, IM Translator, but it doesn't do very well on these. It even thinks the second one is Welsh.
Some are coming up as Uni Code.
It does however have a vocalisation function, but that is in the original language.
It's certainly a weird mystery.