Examine source code of GitHub Release

{
  "manifest_version": 2,
  "name": "GitHub Release",
  "description": "GitHub Release",
  "version": "1.0.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "tabs",
    "scripting",
    "https://github.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "GitHub Release",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9516f44d-6d0f-4481-87d5-4248a3f3cbb6}"
    }
  }
}