This extension moves the dash into the gnome main panel so that the application launchers and system tray are combined into a single panel, similar to Windows. You don't need to install Dash to Dock extention if you install Dash to Panel extention.
Removes window is ready Notification
Auto selects headsets when possible instead of showing a dialog
Changes position of the notification banner from the default to the right side of the screen.
This extension allows configuring the same timeout for all notifications. It also allows ignoring the idle state.
Display internet speed in top bar in gnome shell
In case of Ubuntu, disable the Built-in extention Ubuntu Dock as it doesn't provide much customization.