Examine source code of Video Dominator

{
  "version": "2.8.0",
  "content_scripts": [
    {
      "js": [
        "content.video-dominator.bundle.js"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "name": "Video Dominator",
  "description": "Hover over any video, hold the right mouse button down, and use mouse wheels or buttons to seek, adjust volume, speed, and more.",
  "icons": {
    "16": "icon-16.png",
    "19": "icon-19.png",
    "24": "icon-24.png",
    "32": "icon-32.png",
    "38": "icon-38.png",
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "optional_permissions": [
    "downloads"
  ],
  "permissions": [
    "activeTab",
    "storage"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{a2e40c21-fca8-4200-8f58-872d837e50f4}",
      "strict_min_version": "102.0"
    }
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "browser_action": {
    "default_title": "Video Dominator",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "19": "icon-19.png",
      "24": "icon-24.png",
      "32": "icon-32.png",
      "38": "icon-38.png",
      "48": "icon-48.png",
      "96": "icon-96.png"
    }
  },
  "commands": {
    "_execute_browser_action": {
      "description": "Open popup"
    }
  },
  "web_accessible_resources": [
    "content-mw.youtube.bundle.js"
  ]
}