Ok. Mozilla was spreading itself too thin, spending resources trying to compete with multiple products against established brands that were already way ahead of them. They needed to focus down onto their core product rather than frivolously cast about.
And AI is the technology of the future, despite all the whinging and griping by commenters on the subject. It's being incorporated into the other major browsers, it's a must-have if Firefox is to remain relevant. I'm sure you'll be able to turn it off in the settings if you don't want it and if you're really concerned about getting AI cooties there'll be niche forks that are compiled without it.