Enabling
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3. Accessing ExtensionBrowse for Tray Icons GNOME 3 Extension Online Open it with Firefox or Google-Chrome Web Browser. 
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4. EnablingThen to Enable Tray Icons GNOME 3 Extension 
 Just Slide the Widget in the Top-Right Corner:  And finally, you should Find the System Tray Working!   
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5. ManagingAgain to Manage GNOME 3 Extensions from Shell 
 First, Install the GNOME Tweaks Tool:sudo apt install gnome-tweaks And then Open it from the Dashboard:   Finally, you can easily and visually Manage all your GNOME 3 Extensions:   
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