Examine source code of GitHub Code Editors

{
  "name": "GitHub Code Editors",
  "description": "Open GitHub repos in different online code editors",
  "version": "0.6",
  "author": "Yankee Maharjan",
  "manifest_version": 2,
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc3afd1b-14dd-4090-ac05-37d63cd2a5e0}"
    }
  }
}