This is a perfect add-on! Works exactly how I wanted the default container application to work - keeping my link-clicking more private by opening links in isolated containers.

Just a thought for the clear history feature - I know that you cannot clear based on container which would be ideal, but can you clear history items that are newer than the container open time? i.e. if I open clear-history-container at 11AM, navigate to example.com and click around for a while, then close the container, can you delete all example.com* history that happened after 11AM? Then you aren't wiping the entire site from history, just any clicks during the duration the tab was opened.