Examine source code of MangaAdBlocker

{
  "manifest_version": 2,
  "name": "MangaAdBlocker",
  "version": "1.0",
  "description": "Removes propaganda from the website mangalivre.",
  "icons": {
    "48": "icons/mangalivre.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://mangalivre.net/ler*"
      ],
      "js": [
        "manga-ad-blocker.js"
      ]
    }
  ]
}