Examine source code of DLsitePlay_Addon

{
  "manifest_version": 2,
  "name": "DLsitePlay_Addon",
  "version": "1.0.0",
  "description": "DLsitePlayに新しい機能を追加します",
  "browser_specific_settings": {
    "gecko": {
      "id": "DLsitePlayAddon@doma-itachi"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://play.dlsite.com/*"
      ],
      "all_frames": true,
      "js": [
        "main.js"
      ],
      "css": [
        "main.css"
      ]
    }
  ],
  "permissions": [
    "storage",
    "unlimitedStorage"
  ]
}