On the web alone it should be close to a billion users with support for JXL due to Safari’s market share.
[1]: https://cloudinary.com/blog/jpeg-xl-how-it-started-how-its-g...
Firefox hasn't made a technical decision without first forwarding the minutes to Mountain View and Redmond since roughly 2017.
Every nine-figure Google wire lands promptly converts into $450 k-per-head salary vapor and off-site "all-hands," while the same week another 250 actual engineers get an email that begins: "You're talented and valued BUT-."
Servo? Jettisoned.
MDN? Gutted.
Security teams? Re-org'd into a Slack channel no one reads.
And the Foundation helpfully reminds donors:
"Your gifts don't pay for Firefox engineering."
No kidding. They pay for glossy pamphlets proclaiming the open-web gospel, first-class flights to "advocacy summits," and Mitchell Baker's $2.5 million thank-you note. Firefox isn't a browser; it's a loss-leader Google keeps in the closet for the next antitrust subpoena.