Examine source code of Web Injector

{
  "manifest_version": 3,
  "name": "Web Injector",
  "description": "Custom any website with full control.",
  "version": "1.3.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "web-injector@eslam-gomaa.tools",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Web Injector",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png",
    "128": "icon.png"
  },
  "options_ui": {
    "page": "dashboard/dashboard.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "mode/dark-mode.css",
        "mode/rtl-fixer.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}