Examine source code of RepeatMoment

{
  "manifest_version": 3,
  "name": "RepeatMoment — Replay the Moments You Love",
  "version": "1.5.0",
  "description": "Replay any moment of a video as many times as you like, or endlessly — and line up moments into playlists that play automatically.",
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://*.youtube.com/*",
    "https://youtu.be/*",
    "https://*.vimeo.com/*",
    "https://*.dailymotion.com/*",
    "https://*.twitch.tv/*",
    "https://*.bilibili.com/*",
    "https://rumble.com/*",
    "https://odysee.com/*",
    "https://*.coursera.org/*",
    "https://*.udemy.com/*"
  ],
  "optional_host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "RepeatMoment",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*",
        "https://youtu.be/*",
        "https://*.vimeo.com/*",
        "https://*.dailymotion.com/*",
        "https://*.twitch.tv/*",
        "https://*.bilibili.com/*",
        "https://rumble.com/*",
        "https://odysee.com/*",
        "https://*.coursera.org/*",
        "https://*.udemy.com/*"
      ],
      "js": [
        "src/common/strings.js",
        "src/common/util.js",
        "src/common/sites.js",
        "src/content/ticker.js",
        "src/content/loop.js",
        "src/content/panel.js",
        "src/content/main.js"
      ],
      "css": [
        "src/content/panel.css"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{da535598-4b47-4aa9-b793-c13121eefba9}",
      "strict_min_version": "128.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}