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Rated 5 out of 5 stars
This multisidebar add-on has been updated by ChoGGi who is an author of another Firefox add-on called Stylish-Custom here: https://addons.mozilla.org/en-US/firefox/addon/12105/
The new download link for the updated Multisidebar add-on is here: http://choggi.dyndns.org/misc/multisidebar-0.2.3X(firefox%203.6).xpi So it is a VERY SAFE and TRUSTED download.