Examine source code of Asura+ Blocker

{
  "manifest_version": 2,
  "name": "Asura+ Blocker",
  "version": "1.0",
  "description": "Blocks intrusive popups and ads on AsuraComic.",
  "permissions": [
    "tabs",
    "activeTab",
    "storage"
  ],
  "host_permissions": [
    "*://asuracomic.net/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "null@userinput.dev",
      "strict_min_version": "68.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://asuracomic.net/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}