Examine source code of Cleaner Video Controls

{
  "manifest_version": 2,
  "name": "Streamline Video Controls",
  "version": "1.5",
  "description": "Hide YouTube mini-player and theater mode icons and add a 2x speed button for YouTube, X feed videos, and Instagram videos.",
  "permissions": [
    "activeTab",
    "*://www.youtube.com/*",
    "*://x.com/*",
    "*://*.x.com/*",
    "*://twitter.com/*",
    "*://*.twitter.com/*",
    "*://instagram.com/*",
    "*://*.instagram.com/*",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "*://x.com/*",
        "*://*.x.com/*",
        "*://twitter.com/*",
        "*://*.twitter.com/*",
        "*://instagram.com/*",
        "*://*.instagram.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube.controls@simplelogin.com",
      "strict_min_version": "58.0"
    }
  },
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "options_page": "options.html"
}