Examine source code of Block Finder (Kodular)

{
  "manifest_version": 2,
  "default_locale": "pt_BR",
  "name": "__MSG_ext_name__",
  "description": "__MSG_ext_desc__",
  "version": "1.4.16",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_title": "__MSG_popup_title__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "32": "icon-32.png",
      "48": "icon-48.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "sidebar_action": {
    "default_title": "__MSG_popup_title__",
    "default_panel": "sidebar.html",
    "default_icon": "icon-32.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "webNavigation",
    "*://api.gumroad.com/*",
    "*://gumroad.com/*",
    "*://*.gumroad.com/*",
    "*://script.google.com/*",
    "*://script.googleusercontent.com/*",
    "*://creator.kodular.io/*",
    "*://ai2.appinventor.mit.edu/*",
    "*://builder.niotron.com/*",
    "*://make.powerapps.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://creator.kodular.io/*",
        "*://ai2.appinventor.mit.edu/*",
        "*://builder.niotron.com/*",
        "*://make.powerapps.com/*"
      ],
      "js": [
        "content.js",
        "embedded-panel.js"
      ],
      "css": [
        "embedded-panel.css"
      ],
      "all_frames": true,
      "match_about_blank": false,
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "embedded-panel.css",
    "icon-128.png",
    "sidebar.html",
    "sidebar.js",
    "sidebar.css",
    "style.css"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'; connect-src 'self' https://api.gumroad.com https://gumroad.com https://*.gumroad.com https://script.google.com https://script.googleusercontent.com;",
  "browser_specific_settings": {
    "gecko": {
      "id": "kbf@tjsdeveloper",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "authenticationInfo",
          "personallyIdentifyingInfo"
        ]
      }
    }
  }
}