Examine source code of Video Speed control play

{
  "manifest_version": 2,
  "name": "Video Speed Controller",
  "version": "1.0.4",
  "description": "Control HTML5 video playback speed with on-screen controls and keyboard shortcuts.",
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "css": [
        "content_style.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_title": "Video Speed Controller",
    "default_popup": "popup.html"
  },
  "commands": {
    "increase-speed": {
      "suggested_key": {
        "default": "Ctrl+Alt+D",
        "mac": "MacCtrl+D"
      },
      "description": "Increase video speed"
    },
    "decrease-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "MacCtrl+S"
      },
      "description": "Decrease video speed"
    },
    "reset-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+R",
        "mac": "MacCtrl+R"
      },
      "description": "Reset video speed to 1x"
    },
    "set-custom-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+G",
        "mac": "MacCtrl+G"
      },
      "description": "Set video to custom speed (default 2x)"
    },
    "advance-video": {
      "suggested_key": {
        "default": "Ctrl+Shift+Right",
        "mac": "Command+Shift+Right"
      },
      "description": "Advance video"
    },
    "rewind-video": {
      "suggested_key": {
        "default": "Ctrl+Shift+Left",
        "mac": "Command+Shift+Left"
      },
      "description": "Rewind video"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "playback@latelieria.tech"
    }
  }
}