I take a slightly different approach. I also have two profiles, but I almost never use the "just make it work" profile, because I can basically do everything I

I take a slightly different approach. I also have two profiles, but I almost never use the "just make it work" profile, because I can basically do everything I want to do with my main profile. The main profile has two extensions, uBlock Origin default settings except javascript off by default, and multi-account containers. Privacy/security settings are generally dialed to the max (sanitize on close, RFP on, HTTPS everywhere). If I have to use javascript, it's a simple toggle in uBlock. If you have concerns about cross-site cookies/browsing multiple sites, you can use multi-account containers for extra protection and/or have first-party isolation on in about:config. > (I implement this second stock Firefox environment not with a profile but by changing the $HOME environment variable before I run this Firefox. Firefox on Unix helpfully respects $HOME and having the two environments be completely separate avoids various potential problems.) Curious what problems the author is referring to here.