Examine source code of Spectra — Audio Visualizer

{
  "manifest_version": 3,
  "name": "Spectra — Audio Visualizer",
  "version": "0.2.0",
  "description": "Music visualizer for Spotify, YouTube and any tab with sound. 32 visuals, 8 that follow your movement. Nothing leaves your browser.",
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "action": {
    "default_title": "Visualize this tab's audio (Alt+Shift+V)",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+V"
      },
      "description": "Toggle the visualizer overlay"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "spectra-visualizer@hotelwhyfy.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}