Examine source code of Universal Audio Equalizer

{
  "manifest_version": 2,
  "name": "Universal Audio Equalizer",
  "version": "2.1.0.1",
  "description": "Firefox port: per-tab 11-band equalizer with presets and volume control.",
  "author": "Braconnier",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "src/popup.html",
    "default_title": "Universal Audio Equalizer"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "src/icons/icon16.png",
    "32": "src/icons/icon32.png",
    "48": "src/icons/icon48.png",
    "64": "src/icons/icon64.png",
    "128": "src/icons/icon128.png"
  },
  "web_accessible_resources": [
    "src/import.html",
    "src/import.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-eq-firefox@braconnier.local",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}