Flash works Again

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "version": "1.1",
  "name": "__MSG_name__",
  "description": "__MSG_desc__",
  "default_locale": "en",
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "notifications"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "icons": {
    "128": "static/icons/icon128.png"
  },
  "action": {
    "default_icon": "static/icons/icon128.png",
    "default_popup": "html/popup.html",
    "default_title": "__MSG_title__"
  },
  "background": {
    "service_worker": "sw.js"
  },
  "sandbox": {
    "pages": [
      "html/player.html"
    ]
  },
  "content_scripts": [
    {
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScripts/content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "libs/ruffle/*.js",
        "libs/ruffle/*.wasm"
      ],
      "matches": [
        "*://*/*"
      ]
    }
  ],
  "commands": {
    "_execute_action": {}
  }
}