Not closing loaded tabs. Works flawlessly for the ~20 tabs, does the job for the first ~200 tabs, from there on, new tabs just keeps opening until browser crashes due to too many tabs

EDIT: Found the problem. This add-on doesn't close any loaded tab that opened in a temporary container when used with Temporary Containers add-on, please fix! Work around for now is to turn off Automatic mode in Temporary Containers.