Examine source code of Moodle Unlocker

{
  "manifest_version": 2,
  "name": "Moodle-RMB-Unlocker",
  "version": "1.0",
  "description": "Free your Moodle.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/48.png",
      "96": "icons/96.png"
    },
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.edu.ua/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}