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manifest.json

{
  "manifest_version": 2,
  "name": "CodeSandbox",
  "short_name": "CodeSandbox",
  "version": "2.1",
  "description": "Quickly open a new Sandbox and this extentions adds an 'Open in CodeSandbox' button to GitHub repos",
  "homepage_url": "https://codesandbox.io",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ],
      "matches": [
        "https://github.com/*"
      ]
    }
  ]
}