TL;DR: Mozilla has a new CEO and a new mission: transform Firefox into an AI browser. That has run into some snags, as Firefox users don’t seem that interested in AI. Mozilla is forging ahead, utilizing deceptive patterns (previously known as dark patterns) to nag and annoy people into enabling AI features. You can see this in the introduction of Link Previews, an extremely invasive anti-feature that exists solely to push AI into your experience.
Within the group of people who would use Firefox, you have tech folks, security folks, people who do their research on topics, and you have a load of generic “I hate big companies” contrarians. It’s that last group who enjoy complaining.
Mozilla is not a big company, put in context.