Examine source code of 444hsz

{
  "name": "444hsz",
  "short_name": "444hsz",
  "version": "1.4.0.23",
  "manifest_version": 2,
  "author": "nerblock",
  "description": "Kommenteld szabadon a 444.hu cikkeit!",
  "permissions": [
    "http://*.444.hu/",
    "https://*.444.hu/"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*.444.hu/*",
        "https://*.444.hu/*"
      ],
      "exclude_matches": [
        "*://kor.444.hu/*",
        "*://membership.444.hu/*"
      ],
      "js": [
        "444hu_comments.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    "444hu_comments_inject.js",
    "444hu_comments_inject_legacy.js",
    "backburner.js",
    "444hu_comments.css",
    "444hu_comments_legacy.css",
    "images/444hsz.svg",
    "images/view_sidebar_black_24dp.svg",
    "images/settings_black_24dp.svg"
  ],
  "page_action": {
    "show_matches": [
      "*://*.444.hu/*"
    ],
    "hide_matches": [
      "*://kor.444.hu/*",
      "*://membership.444.hu/*"
    ],
    "default_icon": {
      "16": "images/icon16.png",
      "19": "images/icon19.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png",
      "38": "images/icon38.png"
    }
  },
  "icons": {
    "16": "images/icon16.png",
    "19": "images/icon19.png",
    "24": "images/icon24.png",
    "32": "images/icon32.png",
    "38": "images/icon38.png",
    "48": "images/icon48.png",
    "96": "images/icon96.png",
    "128": "images/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{da4a9294-df95-43c3-98dd-fad43f2105b4}"
    }
  }
}