Examine source code of not8

{
  "name": "not8",
  "version": "2.5.0",
  "description": "Shareable sticky notes for team website review and user feedback",
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "storage",
    "identity"
  ],
  "host_permissions": [
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "page": ""
  },
  "externally_connectable": {
    "matches": [
      "*://localhost/*",
      "*://app.not8.co/*"
    ]
  },
  "action": {
    "default_title": "Click to open not8",
    "default_icon": {
      "16": "images/icon.png",
      "32": "images/icon.png",
      "48": "images/icon.png",
      "128": "images/icon.png"
    }
  },
  "icons": {
    "16": "images/icon.png",
    "32": "images/icon.png",
    "48": "images/icon.png",
    "128": "images/icon.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "*.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "manifest_version": 3,
  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAi1EVYaaf96eeiCW9qXc3R/bruOwmFsUi6s73gtrigHGl7sLVzGNcJc5vHbDIGORknONkemhcJA/m/UF3A+Zo6KkVWcWkn2H0vKG5tufTnLeiwayaCKB3ha60yiRdcRR145m6zWVOL2bEnO9p5AJLB/etH9RYQKtdANfPjZOx2TOGcKYglvlTawRN3G55IAs4KDbV0+iFHWSS2VUnqEfP6exj9YF9AFdydtjtuihTaRugjhYzfdxVz47pJrM7/SzaSdKRqFhOGtm5OOW3YIIiMhpEKeDXR/LgPm9dirUHYNnZT2IccF9247l9Qk5nNzR4/RfXy/RFHckPs85TylKnfQIDAQAB",
  "oauth2": {
    "client_id": "405376343073-n3ic8amfjq7lr794jn6dslhd7opul1p5.apps.googleusercontent.com",
    "scopes": [
      "openid",
      "email",
      "profile"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "vlad@not8.co"
    }
  }
}