Examine source code of Video Speed Controller Vn

{
  "manifest_version": 2,
  "name": "Video Speed Controller",
  "version": "1.3",
  "description": "Control the playback speed of HTML5 videos easily.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "icons/logo_64.png",
    "default_popup": "popup.html"
  },
  "commands": {
    "increase-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+Up"
      },
      "description": "Increase video speed"
    },
    "decrease-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+Down"
      },
      "description": "Decrease video speed"
    },
    "reset-speed": {
      "suggested_key": {
        "default": "Ctrl+Shift+R"
      },
      "description": "Reset video speed"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4cfa5001-867b-4122-b066-e4770f864fe4}"
    }
  }
}