Examine source code of Audio Only for YouTube™

{
  "version": "0.2.0",
  "manifest_version": 3,
  "name": "Audio Only for YouTube™",
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://*.googlevideo.com/*"
  ],
  "homepage_url": "https://mybrowseraddon.com/audio-only-for-youtube.html",
  "description": "Listen to audio (no video) in YouTube and all embedded videos.",
  "permissions": [
    "storage",
    "webRequest",
    "declarativeNetRequest"
  ],
  "commands": {
    "_execute_action": {}
  },
  "web_accessible_resources": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "resources": [
        "data/content_script/page_context/inject.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "109.0",
      "id": "{04c0e786-13ad-428f-8106-697cf0dc9701}"
    }
  },
  "action": {
    "default_title": "Audio Only for YouTube™",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "background": {
    "scripts": [
      "lib/config.js",
      "lib/chrome.js",
      "lib/runtime.js",
      "lib/netrequest.js",
      "lib/webrequest.js",
      "lib/common.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": false,
      "run_at": "document_start",
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "data/content_script/inject.js"
      ]
    },
    {
      "all_frames": true,
      "run_at": "document_end",
      "matches": [
        "*://*.youtube.com/embed*"
      ],
      "js": [
        "data/content_script/inject.js"
      ]
    }
  ],
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  }
}