I've used Firefox for a long time because it's been one of the few browsers that doesn't force features that harm its users onto the userbase. It's been leagues beyond the majority for that long time! The introduction of AI features over time has been a bell ringing for the loss of that thoughtful approach to aiding the users. AI in browsers has been used by malicious third parties to steal the data of anyone who visits specific sites, it's prone to misinformation when used to summarize anything, and simply doesn't add any value to the browsing experience. It gets in the way and slows it down, even! If more AI features are added, I will be finding a different browser to use.