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I've been using all sorts of tab extensions in various browsers for years and find this extension particularly useful.
The multiple select functionality is an obvious hole, which I partially fill by using Search Plus and tabjuggler.
I agree with what others have said that it would be great to use standard multiple-select techniques to organise the tabs.
Сервис поддержки клиентов работает на платформе UserEcho
collapse all closed (i.e. with no windows open) nodes would also be good