Examine source code of YugenPatches

{
  "manifest_version": 2,
  "name": "YugenPatches",
  "version": "1.0",
  "description": "Adds a few features to YugenAnime.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://yugenanime.tv/*"
      ],
      "js": [
        "yugenpatches.js"
      ],
      "css": [
        "yugenpatches.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "YugenPatches@trzynu"
    }
  }
}