Examine source code of Easy Volume Compressor

{
  "manifest_version": 3,
  "name": "Easy Volume Compressor",
  "version": "1.0.0",
  "description": "Compresses and equalizes audio volume across all media elements in Firefox",
  "homepage_url": "https://github.com/motoacs/easy-volume-compressor-firefox",
  "developer": {
    "name": "motoacs",
    "url": "https://github.com/motoacs"
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_title": "Easy Volume Compressor",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{deda44b0-c5c7-440b-a70a-f97248ce2e2f}",
      "strict_min_version": "109.0"
    }
  }
}