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Rated 1 out of 5 stars
Version 1.2 NOT WORKED under FireFox 3.6.23. Bookmarks always opened at the end of the tabbar.This user has a previous review of this add-on.
It works perfectly in every version up to the latest (8 at the time of writing) as long as you set your preferences and about:config flags correctly. Also make sure you don't have other extensions that could conflict.
As an experiment make a new profile, install just this extension and set it up as I describe in the description. It will work as advertised. Then you can figure out what you did to break it on your main profile.
Or how about this: stop moaning and fix it yourself. The source code is available. That is what I did when I created Tabs Open Relative (modified) - I fixed Tabs Open Relative instead of just complaining about it.