Rated 4 out of 5 stars

by Siddhartha Dugar on Nov. 15, 2010 ·

Great Idea!
For firefox 4 this can be done simply by
browser.sessionstore.max_concurrent_tabs=1
in about:config

This review is for a previous version of the add-on (1.0). 

by ithinc (Developer) on Nov. 15, 2010 ·

That doesn't work for "Open All In Tabs".