Examine source code of Simple 5-Band Equalizer

{
  "manifest_version": 2,
  "name": "Simple 5-Band Equalizer",
  "version": "1.0",
  "description": "Apply a simple 5-band equalizer to audio/video elements on the current page.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_title": "5-Band EQ",
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ee72902-d006-43fe-b22b-8a05d94fa817}",
      "strict_min_version": "109.0"
    }
  }
}