Fastlane founder Felix Krause has revealed that Facebook and Instagram's in-app browsers inject JavaScript into third-party websites. Krause originally said the in-app browsers were injecting the ...

Recent reports detail how some apps inject JavaScript to track what users do in in-app browsers. Now a tool can help detect the presence of these scripts.

Of course, the developer also notes that not every app that injects JavaScript code into an in-app browser does so for malicious purposes, since JavaScript is the basis of many web features.

1. Open the URL directly on the browser A quick way to be sure of escaping JavaScript injection via in-app browser links is not clicking on these.

A new online tool named 'InAppBrowser' lets you analyze the behavior of in-app browsers embedded within mobile apps and determine if they inject privacy-threatening JavaScript into websites you visit.

However, Krause’s tool detected JavaScript injection when opened in the custom web browsers built into the Facebook, Instagram, and Messenger mobile apps.

Injecting JavaScript code is comparable to installing a keylogger on third-party websites, Felix Krause says TikTok's in-app browser for iOS injects JavaScript code into external websites enabling ...

TikTok's custom in-app browser on iOS reportedly injects JavaScript code into external websites that allows TikTok to monitor "all keyboard ...