Tab Sidebar Extension 1.1.6.1

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Provide a sidebar in the browser that can act as the main tab bar, with extras.

Windows Sidebar
This is the real Sidebar scripted for Windows XP.
Alt-Tab Thingy
It can help you switch tasks faster and more efficiently than ever before!
hin
finding the bookmark and search options on the toolbar
Nightly Tester Tools
a few extras useful to those that regularly test nightly builds of Firefox.
Tab Sidebar Extension
Provide a sidebar in the browser that can act as the main tab bar, with extras.