Examine source code of Kos-emoji

{
  "manifest_version": 2,
  "name": "Kos-emoji",
  "version": "1.0",
  "description": "Changes the way grades are shown.",
  "homepage_url": "https://github.com/AdamVerner/kos-emoji",
  "icons": {
    "48": "icons/kos48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.kos.cvut.cz/*"
      ],
      "js": [
        "kos-emoji.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "media/A_vagner.png",
    "media/B.png",
    "media/C_guth.png",
    "media/D_harold.png",
    "media/E_vagner.png",
    "media/F_noguth.png"
  ]
}