Examine source code of Tanish Volume Booster

{
  "manifest_version": 3,
  "name": "Tanish Volume Booster",
  "version": "1.1.1",
  "description": "Premium volume booster with 10-band equalizer, bass boost, and dedicated audio modes.",
  "permissions": [
    "scripting",
    "storage",
    "activeTab",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Tanish Volume Booster"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "volume-booster@tanish.dev",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "commands": {
    "toggle-mute": {
      "suggested_key": {
        "default": "Alt+Shift+M",
        "mac": "Command+Shift+M"
      },
      "description": "Toggle Mute"
    },
    "volume-up": {
      "suggested_key": {
        "default": "Alt+Shift+Up"
      },
      "description": "Volume Up"
    },
    "volume-down": {
      "suggested_key": {
        "default": "Alt+Shift+Down"
      },
      "description": "Volume Down"
    }
  },
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  }
}