Examine source code of Voscreen Shortcuts

{
  "manifest_version": 2,
  "name": "Voscreen Shortcuts",
  "version": "0.1",
  "description": "Shortcuts for Voscreen",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.voscreen.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "title": "Voscreen Shortcuts",
    "default_popup": "popup.html",
    "icon": "icon16.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{16c0cb9d-57f8-444b-a023-80ebfb90e3d6}"
    }
  }
}