If your parent is like myself, as I have gotten older, the perceived delta between "close to a decade" and "past few years" has converged to approximately nothing.
I know. I am old from pre-Netscape era. Generally speaking I use few years as 3-4 years. Close to a decade as ~8 years. But in this case, worth considering Firefox ( Or Phoenix ) was established 20 years ago. 5 years is quarter of its life time.
Past Few years? I assume you mean from something like 2020? We are now in 2023 they are close to have been doing it for a decade.
I am still surprised to see how the acknowledgement curve plays out in real time. It takes 5 - 8 years before it even hit mainstream.