Examine source code of Sensim — Learn, without really trying.

{
  "manifest_version": 2,
  "name": "Sensim — Learn 100 Languages While You Browse",
  "version": "9.8.0",
  "description": "Master words through daily flashcards, then see them replace English as you browse. 3 new words per day, 1000-day journey.",
  "browser_specific_settings": {
    "gecko": {
      "id": "sensim@sensim.app",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "tabs",
    "https://tducpibeqzcsacmgnmwv.supabase.co/*"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "browser_style": false
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "vocab/*.json"
  ]
}