Examine source code of Readlang Web Reader

{
  "manifest_version": 3,
  "name": "Readlang Web Reader",
  "short_name": "Readlang",
  "description": "Read websites in the language you're learning, translate words you don't know, and we'll create flashcards to help you remember.",
  "version": "0.9.36",
  "browser_specific_settings": {
    "gecko": {
      "id": "steve@readlang.com",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "websiteActivity"
        ]
      }
    }
  },
  "icons": {
    "16": "content/icon16.png",
    "48": "content/icon48.png",
    "128": "content/icon96_128.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "scripting"
  ],
  "host_permissions": [
    "https://readlang.com/*",
    "https://test.readlang.com/*",
    "http://localhost/*"
  ],
  "commands": {
    "import": {
      "suggested_key": {
        "default": "Ctrl+Shift+I"
      },
      "description": "Import text from the current page into Readlang"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://readlang.com/*",
        "https://test.readlang.com/*",
        "http://localhost/*"
      ],
      "all_frames": true,
      "js": [
        "src/extensionConfig.js",
        "src/contentScript.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/allPagesContentScript.js"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "19": "content/icon19.png",
      "38": "content/icon38.png"
    }
  },
  "background": {
    "scripts": [
      "src/extensionConfig.js",
      "src/background.js"
    ]
  }
}