Its add an important function after than Tab Mix Plus deactivated.
Its save my life when i close a tab, the focus switch back to the tab, where i opened the closed tab.
Its help to keep the actual tab sort.

Little fail, when i open a new tab, its opened in last default position, and in milisecunds this extension move it to my wanted position.
I add 5 star if this little failer is corrected.

Works pretty fine. I think we should have this functionality with native Firefox. Thanks!