Hello Ladies and Gentlemen!
I got an System Update and found there something interesting:
The first Point is the first Thing. It means something like ''Tool to activate/deactive Gnome Shell Extensions'' and the other are the Gnome Shell Integration for Browsers.
The first One is Gnome Extensions. The Gnome-own Extensions Manager (that one with the green Puzzle Piece). And the other one's are the chrome-gnome-shell Package. I find that pretty interesting and thought I could share this Info here.
For managing existing Gnome Extensions the Gnome-own Tool is totally okay I would think. But I prefer to use the Extension Manager (the blue Puzzle Piece) because I cannot only manage Extensions, I can install Extensions with it, too.