Literally every single non tech person I know uses these kind of tools. Everyone who searches google gets an AI summary of the results. Microsoft builds this into all their products.
Having an extension that users can CHOOSE to install to do content summaries is a good thing. Either Mozilla does it or OpenAI, Google, Apple, Microsoft do it. Personally id rather people be using a tool made by Mozilla.
its not like they arent focusing on their browser they just released a new address bar packed full of changes and feature to their beta branch.
What is the issue with user privacy? These do not sound like valid concerns to me.