I suspect their financial position has changed. Perhaps Google's being found as a monopoly has made them decide not to help fund Mozilla's efforts as substantially.

Ashley Boyd lead the advocacy team, here's the kind of stuff they were doing:

https://blog.mozilla.org/en/mozilla/mozilla-welcomes-ashley-boyd-vp-of-advocacy/

In fall of 2016, Mozilla fought for common-sense copyright reform in the EU, creating public education media that engaged over one million citizens and sending hundreds of rebellious selfies to EU Parliament. Earlier in 2016, Mozilla launched a public education campaign around encryption and emerged as a staunch ally of Apple in the company’s clash with the FBI. Mozilla has also fought for mass surveillance reform, net neutrality and data retention reform.

https://techcrunch.com/2024/11/05/mozilla-foundation-lays-off-30-staff-drops-advocacy-division/

“The Mozilla Foundation is reorganizing teams to increase agility and impact as we accelerate our work to ensure a more open and equitable technical future for us all. That unfortunately means ending some of the work we have historically pursued and eliminating associated roles to bring more focus going forward,” read the statement shared with TechCrunch.

Reading between the lines, I'd keep an eye on them collecting your data and consider one of the privacy-focused forks.