Check whether user has a Chrome extension installed

Question

I am in the process of building a Chrome extension, and for the whole thing to work the way I would like it to, I need an external JavaScript script to be able to detect if

Answer 1

You could also use a cross-browser method what I have used. Uses the concept of adding a div.

in your content script (whenever the script loads, it should do this)

if ((window.location.href).includes('*myurl/urlregex*')) {
        $('html').addClass('ifextension');
        }

in your website you assert something like,

if (!($('html').hasClass('ifextension')){}

And throw appropriate message.