CLEO (Compact Library Extension Organizer) is a Firefox extension that works with FEBE* to package any number of extensions/themes into a single, installable .xpi file.
Adds "Restart" menu item to "File", and a toolbar button for easy restarting... Localized in all languages.
JumpStart your web experience.
When you open a new tab get immediate access to your most frequently used sites, bookmarks, closed tabs, history search. Similar to Google's Chrome new tab feature.
This extension allows you to show/hide the main menu. It can be accessed through a toolbarbutton, keyboard shortcut and popup-menu-item. It also supports autohide. the statusbar can optionally be hidden.
This add-on simply adds an option to the Firefox’s Tools Menu called “Close Repeated Tabs” which just does that: close the repeated tabs. You won’t ever have to check that page twice again.
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ChromaTabs Plus makes tabs more readily identifiable by tinting each tab a different color depending on the website loaded.
See the "Beta Channel" below for a beta version that is compatible with the new Firefox 4.0 betas.