Examine source code of universal-video-speed-ctrl

{
  "manifest_version": 3,
  "name": "Universal Video Speed Controller",
  "description": "Playback speed controls for HTML5 video on any website - shortcuts, floating widget, popup, and per-site memory.",
  "version": "0.3.0",
  "action": {
    "default_title": "Video Speed Controller",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icons/icon-16.png",
      "32": "assets/icons/icon-32.png",
      "48": "assets/icons/icon-48.png",
      "128": "assets/icons/icon-128.png"
    }
  },
  "icons": {
    "16": "assets/icons/icon-16.png",
    "32": "assets/icons/icon-32.png",
    "48": "assets/icons/icon-48.png",
    "128": "assets/icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://chrome.google.com/webstore/*",
        "https://chromewebstore.google.com/*"
      ],
      "js": [
        "constants.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle",
      "all_frames": true
    },
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "exclude_matches": [
        "https://chrome.google.com/webstore/*",
        "https://chromewebstore.google.com/*"
      ],
      "js": [
        "inject.js"
      ],
      "run_at": "document_start",
      "world": "MAIN",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "universal-video-speed-controller@danishansari.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}