Examine source code of EP Fix

{
  "manifest_version": 2,
  "name": "EP-Fix",
  "version": "1.1",
  "author": "darccyy",
  "description": "Fixes annoying problems with Education Perfect",
  "content_scripts": [
    {
      "matches": [
        "https://www.educationperfect.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  }
}