I'm not sure what you mean by non-malicious extensions being intrusive. I use a number of extensions, mostly content-blocking and privacy-related and they mostly just get out of my way. The Firefox Extension Store also has a recommended extensions feature that shows that the extension has been reviewed by Mozilla for privacy and security. Most extensions I use have this seal.
Yeah, I get that, but it seems to me like that's worse than the security model for any non-containerized application. If you don't trust the author there really isn't much there that will protect you.
That's fair, but my browser has permission to access my data for all websites, and uBlock Origin probably has my best interests in mind more so than Google Chrome.
