Examine source code of Kuplo studio

{
  "manifest_version": 2,
  "name": "Kuplo studio",
  "version": "1.1.5",
  "description": "Rozszerzenie Firefox dla Kuplo — umożliwia szybkie pobieranie danych z linków",
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "icons": {
    "16": "icons/icon-16x16.png",
    "32": "icons/icon-32x32.png",
    "42": "icons/icon-42x42.png",
    "128": "icons/icon-128x128.png"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup/browser/index.html",
    "default_icon": {
      "16": "icons/icon-16x16.png",
      "24": "icons/icon-24x24.png",
      "32": "icons/icon-32x32.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "exclude_matches": [
        "https://kuplo.pl/*",
        "https://stage.kuplo.pl/*"
      ],
      "js": [
        "content/content.js"
      ]
    },
    {
      "matches": [
        "https://kuplo.pl/*",
        "https://stage.kuplo.pl/*"
      ],
      "js": [
        "application/application.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d085fe3f-d4f3-4d9b-983f-6653df7b3143}"
    }
  }
}