Good link. Declining from 880M in Mach 2017 to 805M in December 2019. Declining indeed, but not very fast.

The Monthly Active Users metric is more important, and it has been declining by around 10% each year. That’s very significant. Roughly 25k users lost every day. Mozilla had to lay off almost 10% of its staff this year, and will probably have to keep doing that every year now (unless the decline in users stops). And firing your employees doesn’t usually lead to better products.

On the contrary, the drop is tremendous. Consider that the number of internet users worldwide has grown way up in that timespan!