[svl]

I'd say ~30M, rather than 50M.

They explicitly call out the summer holidays effect above the first graph: "Generally, MAU fluctuates over the course of a year, dropping in the summer months and during holidays." So comparing the peak of Jan 2019 to the low of Jul 2021 isn't giving a good idea of the total loss.

  Jan 28 2019: 253.9M
  Jan 27 2020: 229.5M
  Feb 01 2021: 219.7M

  Jul 22 2019: 224.2M
  Jul 20 2020: 214.1M
  Jul 19 2021: 200.4M

Still, definitely not good; we've seen what happens when web developers believe only a single browser (engine) matters, and we _need_ an organization like Mozilla, which puts user interests above commercial interests, to have a seat at the table.

[codesections]

> They explicitly call out the summer [and winter] holidays effect above the first graph

Given that this is a measure of "Desktop clients active in the past 28 days", that means that there are people tech-savy enough to be regular users of Firefox on a desktop – but who go an entire month without using Firefox because it's Christmas. And enough of those people to show up on this graph.

That blows my mind a bit. I don't doubt it, but wow.

[zamadatix]

Remember FF has been bundled in installers and OEMs have preinstalled it. Out of 200,000,000 users there are probably more users that simply aren't tech-savvy enough to have changed to a different browser than are still on it because they are tech-savvy.