Examine source code of Custom Script Injector

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "version": "1.0.1",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "browser_specific_settings": {
    "gecko": {
      "id": "custom-script-injector@local",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "background": {
        "scripts": [
          "background.js"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_title": "Custom Script Injector",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png",
      "128": "icons/icon128.png",
      "256": "icons/icon256.png",
      "512": "icons/icon512.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png",
    "512": "icons/icon512.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "editor/editor.html",
        "manage/manage.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}