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BX extension enhances the Bookmarks Sidebar with options to Close/Open all folders. It simplifies folder navigation by closing other folders when a particular folder is opened. The extension's functionality can be summarized in just 50 words.

New Tab and Go is a Mozilla Firefox add-on that adds a customizable button to the toolbar window. This button enables users to quickly open a new tab or go to a user-specified webpage with a single click.

SoundDialog extensions enables users to add sound effects to Error, Message, Question, and Alert dialogs. This add-on is available for Firefox 1.4 - 1.5.0.* users.

StedSidebar is a note-taking extension that functions as a hierarchical sidebar. It permits users to develop and organize notes on their sidebar.