Examine source code of HashaToHitomi

{
  "manifest_version": 2,
  "name": "HashaToHitomi",
  "version": "1.5",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.hasha.in/*",
        "*://*.harpi.in/*"
      ],
      "js": [
        "hashaToHitomi.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fe5965a1-eba4-4670-9e7d-4027a4c2ad2c}"
    }
  }
}