Examine source code of Rob's Code Injector

{
  "manifest_version": 3,
  "name": "Rob's Code Injector",
  "version": "1.2.2",
  "description": "Inject custom JavaScript, CSS, and HTML into web pages by URL rules.",
  "browser_specific_settings": {
    "gecko": {
      "id": "robs-code-injector@robscodeinjector.addons",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "minimum_chrome_version": "109.0",
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "webNavigation",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "script/browser-polyfill.min.js",
      "script/shared/constants.js",
      "script/background/index.js"
    ]
  },
  "action": {
    "default_popup": "html/browser-action.html",
    "default_icon": {
      "16": "style/images/icon/icon-16px.png",
      "32": "style/images/icon/icon-32px.png",
      "48": "style/images/icon/icon-48px.png"
    },
    "default_title": "Rob's Code Injector"
  },
  "options_ui": {
    "page": "html/options-ui.html"
  },
  "icons": {
    "16": "style/images/icon/icon-16px.png",
    "32": "style/images/icon/icon-32px.png",
    "48": "style/images/icon/icon-48px.png"
  }
}