Examine source code of SignUp - Sign Language for Netflix & Disney+

{
  "version": "2.5.7",
  "name": "SignUp - Sign Language for Netflix & Disney+",
  "description": "This extension allows the user to overlay videos of American Sign Language interpreting onto Disney+ and Netflix videos.",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "signupcaptions@gmail.com"
    }
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "img/icon128.png"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.disneyplus.com/*",
        "https://*.netflix.com/*",
        "https://*.peacocktv.com/*",
        "https://*.hotstar.com/*",
        "https://*.youtube.com/*"
      ],
      "js": [
        "/vendor/youtube/page_script.js",
        "/vendor/youtube/iframe_api.js",
        "/vendor/youtube/www-widgetapi.js",
        "/contentScript.bundle.js"
      ],
      "css": [
        "/vendor/nunito.css",
        "/vendor/jquery-ui.css",
        "/content.styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "nativeVideo/video.html",
        "img/*",
        "src/images/*",
        "fonts/*",
        "popout.html",
        "/vendor/nunito.css",
        "/vendor/jquery-ui.css",
        "/vendor/images/*"
      ],
      "matches": [
        "https://*.disneyplus.com/*",
        "https://*.netflix.com/*",
        "https://*.peacocktv.com/*",
        "https://*.hotstar.com/*",
        "https://*.youtube.com/*"
      ]
    }
  ]
}