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Sidebery - Manage your tabs and bookmarks in sidebar.
UpEffect - Crowdfunding for social good products
Tree Style Tab - Tree Style Tab is an all-in-one Firefox extension that provides ability in order to operate tabs as a tree.
Tickr - TICKR is GTK-based RSS READER application which displays RSS FEEDS in a TICKER bar on your desktop.
Firefox Multi-account Containers - Sign in to two different accounts on the same site
Creddon - Tweet for a cause and a sponsor will donate $1 to charity