Examine source code of Tab Sampler

{
  "manifest_version": 2,
  "name": "Tab Sampler",
  "version": "1.0",
  "description": "Record 3–10s audio sample from the current tab and save locally as .wav.",
  "default_locale": "en",
  "icons": {
    "48": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabsampler@example.com",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}