Examine source code of Echo360 Captions

{
  "manifest_version": 3,
  "name": "Echo360 Captions",
  "short_name": "Echo360 CC",
  "version": "0.2.1",
  "description": "UWA Echo360 lectures expose transcripts, not captions. Adds a CC button that overlays the active transcript on the video player.",
  "author": "spuddydev",
  "homepage_url": "https://github.com/spuddydev/echo360-captions",
  "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"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.echo360.net.au/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "echo360-captions@spuddydev.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}