Examine source code of Lingopede

{
  "manifest_version": 2,
  "name": "Lingopede Browser Companion",
  "description": "Translate any word on the web and save it as a flashcard. Clickable captions on YouTube and Netflix.",
  "version": "1.0.2",
  "short_name": "Lingopede",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "lingopede@lingopede.xyz",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "personallyIdentifyingInfo",
          "websiteContent"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "scripting",
    "cookies",
    "contextMenus",
    "https://lingopede.xyz/*",
    "*://*.youtube.com/*",
    "*://*.netflix.com/*"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Lingopede",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/netflix.js"
      ]
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/youtube.js"
      ]
    }
  ]
}