What a big disappointment. I was excited to try this out since I actually had a problem this add-on had the potential to solve: I typically use the 'Firefox Home (Default)' setting for new tabs. When I add a new tab when presenting my desktop in Teams during remote work, the tab would show icons for websites related to my personal browsing. I expected this add-on to segregate history (which, I believe, the icons depend on) by container instead of just cookies. No, it doesn't. What is the point of not 'contain'ing the history?