Examine source code of Marxist Reader

{
  "manifest_version": 2,
  "name": "Marxist Reader",
  "author": "Vinícius Melo - @vinimlo",
  "version": "1.0",
  "homepage_url": "https://gitlab.com/vinimlo/marxist-reader/tree/master",
  "description": "Improves the reading experience at marxists.org articles.",
  "icons": {
    "48": "icons/marx.svg",
    "96": "icons/marx.svg"
  },
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.marxists.org/portugues/*"
      ],
      "js": [
        "marxistReader.js"
      ]
    }
  ]
}