Examine source code of Flashcards maker

{
  "manifest_version": 2,
  "name": "Flashcards maker",
  "version": "1.1",
  "description": "Counts words on a webpage and makes flashcards from them using scrapping of 3rd party websites",
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "icons": {
    "48": "assets/icons/cloud-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "fc-browser-maker@devadam.pl"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.deepl.com/*"
      ],
      "js": [
        "pages/content.deepl.com.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Summarize",
    "default_icon": "assets/icons/cloud-32.png"
  }
}