Examine source code of Image to Text (OCR)

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "2.1.3",
  "manifest_version": 2,
  "icons": {
    "16": "images/16x16.png",
    "48": "images/48x48.png",
    "128": "images/128x128.png"
  },
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "default_locale": "en",
  "permissions": [
    "<all_urls>",
    "contextMenus",
    "activeTab",
    "tts",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/16x16.png",
      "48": "images/48x48.png",
      "128": "images/128x128.png"
    }
  },
  "externally_connectable": {
    "matches": [
      "*://localhost/*",
      "*://imagetext.xyz/*",
      "*://*.imagetext.xyz/*"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.bundle.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "fxnoob71@gmail.com",
      "strict_min_version": "42.0"
    }
  }
}