Examine source code of Video Speed Control Plus

{
  "manifest_version": 2,
  "name": "Watch and download on Shikimori",
  "version": "3.0.5",
  "description": "The addon adds the ability to watch and download anime on the Shikimori website.",
  "icons": {
    "128": "./images/icons/logo128.png"
  },
  "permissions": [
    "*://*.anilibria.tv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://shikimori.one/*"
      ],
      "js": [
        "./scripts/helpers/helpers.js",
        "./scripts/helpers/shikimori.js",
        "./scripts/helpers/anilibria.js",
        "./scripts/helpers/kodik.js",
        "./scripts/torrent.js",
        "./scripts/player.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca911399-18d6-437f-86e4-b457b5888eeb}"
    }
  }
}