Examine source code of Block A/B Testing (YouTube)

{
  "manifest_version": 3,
  "name": "Remove Multi Titles (YouTube)",
  "version": "2.4.0",
  "author": "Arzuparreta",
  "homepage_url": "https://github.com/Arzuparreta/remove-multi-titles-yt",
  "description": "Pins the first-seen title and thumbnail per video on YouTube (watch, Shorts, and lists) to reduce A/B title and thumbnail flicker.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png",
    "512": "icons/icon512.png"
  },
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Remove Multi Titles (YouTube)",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "webNavigation"
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content-main.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "lib/browser-polyfill.min.js",
        "content.js"
      ],
      "run_at": "document_start",
      "world": "ISOLATED"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a7b3c9d2-4e1f-4a8b-9c0d-1e2f3a4b5c6d}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}