Examine source code of Studio EQ

{
  "manifest_version": 2,
  "name": "Studio EQ",
  "version": "1.1.0",
  "description": "Графический эквалайзер для аудио и видео во вкладке. Настройки только локально; данные не передаются третьим лицам. / Graphic EQ for media in the tab; settings stay on device only.",
  "author": "Studio EQ",
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c4f5b8e2-1a9d-4f7c-9e3b-2d6a8c1e5f00}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "browser_action": {
    "default_title": "Studio EQ (Spotify look)",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/eq-inject.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "inject/page-audio.js"
  ]
}