wordpress plugin - bug or not.

[catafest]

I used the last version of wordpress - version 4.6.1. I make all settings on console google and firebase to have GCM API Key and GCM Project Number.
If I uncheck I got this:

The plugin will automatically create a Web App Manifest for you and add it to your page.

You need to add "gcm_sender_id": "xxxx and "gcm_user_visible_only": true to your manifest

As you can see the output is missing one "
Also is not working , the gmp extension color is red.
I set my icon notification but the website come with default bell icon.