I think some of the answer is expressed in the article:
To service and retain this loyal userbase then, you might imagine that Mozilla would address their needs and concerns with what made Phoenix a great first version back in 2002. A lightweight and versatile standards-compliant and open-source web browser with acceptable privacy standards, and without any other non-browser features attached to it. Just a browser, only a browser, and above all, a fast browser.
Instead, Mozilla appear to be following a course calculated to alarm rather than retain these users. Making themselves an AI-focused organisation, neglecting their once-unbeatable developer network, and trying to sneak data gathering into their products.





How frustrating about the hangs, looks like this has been a problem for years in various desktops and file managers and you’ve already found the best mitigation (keeping the mounts out of home)