Examine source code of Youtube Overlay Remover

{
  "manifest_version": 2,
  "name": "Youtube Overlay Remover",
  "version": "1.2",
  "description": "Toggle to hide or add back Youtube Video Player overlay",
  "icons": {
    "48": "icons/ytr48.png",
    "96": "icons/ytr96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/ytr16.png",
      "32": "icons/ytr32.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "ytoverlayremover@gmail.com"
    }
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "toggle-feature": {
      "suggested_key": {
        "default": "Alt+Shift+X"
      },
      "description": "Hide Youtube Player Overlay"
    }
  }
}