The issue really is: Google isn't phasing our 3rd party cookies out of charity. They are clearly looking for a way to keep doing all the things third-party cookies enable after they go away.
Here we find people saying (through legislative and regulatory action) that they want to end the use of 3rd party cookies because the bad behaviors they enable, and they are rightly outraged at the efforts to comply with the letter of the law while running roughshod over the intent of the laws.
Firefox is not a product of the 800lb gorilla of targeted ad revenue. The Mozilla foundation could live without the ad revenue tied 3rd party cookies. They feel pressure from their users (people like us) who want to not be tracked everywhere, and ending the use of 3rd party cookies is one technical step.
At some point in the past year it seems the privacy concerns reached a critical mass. The Mozilla foundation is responding in ways to keep its browser share relevant.
Sort of true. To know what a non-profit's motivations are, look at the biggest donors and donations. Some of the Mozilla Foundation's money comes from the Mozilla Corporation, which does get a lot of money from the big tech companies.
Here we find people saying (through legislative and regulatory action) that they want to end the use of 3rd party cookies because the bad behaviors they enable, and they are rightly outraged at the efforts to comply with the letter of the law while running roughshod over the intent of the laws.