In gnome 3, gnome-shell is used for displaying the top bar. the widgets can be installed online from http://extensions.gnome.org. after installation, the deployments can be set by visiting http://extensions.gnome.org/local. on local host, the commandGnome-shell-extension-prefsIs used for configuration. At present, the extensions I use are:
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Advanced Settings in usermenu: Show advanced settings (gnome tweak tool) in usermenu
Alternative status menu: replaces gnome shell status menu with one showing suspend/hibernate and power off as separate items
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Applications menu: Add a category-based menu for applications.
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Caffeine: Disable the screensaver and auto suspend
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Panel-docklet V14: This extention represents all opened windows as icons in a panel. there are a lot of possibilities for customization. it can be used as a docklet, panel or as anything else you create. it also supports multiple screens, workspaces, window-titles, favorites, dragging...
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Places Status Indicator: Add a menu for quickly navigating places in the system.
Show desktop button: places a button to the left of the window list to hide all windows, and the overview when active, and show the current desktop.
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WEATHER: a simple extension for displaying weather information from several cities in GNOME Shell
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Workspace indicator: put an indicator on the panel signaling in which workspace you are, and give you the possibility of switching to another one.