Yeah, a good browser should probably take an approach similar to Linux Mint.

It has to be easy to install and it has to work great for like 99.9% of normal uses without changing a single setting.

But, being free and open, if you are tech savvy then you can change and customize whatever you want. Sometimes it means I can lock down the privacy and data storage in my browser, and sometimes it means I can change the icon on my work computer's "start" button to be a check engine light. It's all just part of being able to use your computer the way you want to.

This is an UI issue. You could just show them a landing Page and ask them if they want this new feature, and then it installs the extension in the background, without explicitly ask the user to go to the extension page to install something by hand.