Examine source code of No More Spoil : Blur elements on web pages

{
  "manifest_version": 3,
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "version": "2.2.1",
  "default_locale": "en",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    }
  },
  "permissions": [
    "scripting",
    "storage",
    "tabs",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://addons.mozilla.org/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "css": [
        "content-style.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5b3673b1-f277-425f-b74a-0c45339b5e62}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+N"
      },
      "description": "Open No More Spoil popup"
    },
    "toggle-extension": {
      "suggested_key": {
        "default": "Alt+Shift+O"
      },
      "description": "Toggle No More Spoil on/off"
    }
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  }
}