Here is a method you can try.
1.First click Control Panel.
2.Aftee that click System and Security, then select Appearance and Personalization.
3. Under Taskbar and Start Menu section click on the Customize icons on the taskbar link.
4. There are two button of these icons and notification, they can be set to show icon and notifications or Hide icon and notifications or only show notifications. If you want to show the icons and notifications always then you chose Always show all icons and notifications on the taskbar available at the bottom. Also you can have the option to Turn system icons on or off.No matter what you select, remember click OK.
For Firefox browser, to restore plugin is very easy, just follow our instructions below.
1.Open Firefox, in the menu-bar, select Tools > Add-ons
2.Click Add-ons. The Add-ons Manager page will open.
3.Find the plugin you want to restore, click on Enable on the right side.