Can I inject Javascript code into Chrome Custom Tabs

Question

In my app, I am currently using a web view to display some content. Then, I use Javascript injection to quickly fill out the form for the user.

The only issue is, W

Answer 1

There's supposed to be no way to inject Javascript to Chrome web browser. If you can execute the Javascript queries to chrome via some third party apps, thereby you can read all the cookies, clear every sessions, and whatever the javascript is capable of. Which is really a huge security flaw.

What you can do is to load your URL in webview and execute the javascripts there. That's the only possible i've ever heard of. This is the same technique used for EPUB documents, where we load the complete HTML content in webview then we execute external Javascript queries into that view, so you can modify the HTML, CSS attributes.