Examine source code of Medium volcano

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "0.8.2resigned1",
  "author": "wulkanowy",
  "homepage_url": "https://github.com/wulkanowy/medium-volcano",
  "default_locale": "pl",
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://uonetplus-opiekun.vulcan.net.pl/*/*/Oceny*/Wszystkie*",
        "*://uonetplus-opiekun.eszkola.opolskie.pl/*/*/Oceny*/Wszystkie*",
        "*://uonetplus-opiekun.edu.gdansk.pl/*/*/Oceny*/Wszystkie*",
        "*://uonetplus-opiekun.umt.tarnow.pl/*/*/Oceny*/Wszystkie*",
        "*://uonetplus-opiekun.resman.pl/*/*/Oceny*/Wszystkie*",
        "*://uonetplus-opiekun.fakelog.cf/*/*/Oceny.mvc/Wszystkie*"
      ],
      "js": [
        "bookmarklet.js"
      ],
      "run_at": "document_end"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": "icon-48.png",
    "default_title": "__MSG_extensionName__"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{54137c7c-9fd2-47ce-9046-55d784afe738}"
    }
  }
}