My blockstack app kept pointing to localhost, here is how to make it point to browser.blockstack.org. This is for the sign in, in the hello world tutorial
document.getElementById(‘signin-button’).addEventListener(‘click’, function(event) {
event.preventDefault()
var BLOCKSTACK_HOST = 'https://browser.blockstack.org/auth'
var DEFAULT_SCOPE = ['store_write']
var redirectURI = `${window.location.origin}/`
var manifestURI = `${window.location.origin}/manifest.json`
var scopes = DEFAULT_SCOPE
var authRequest = blockstack.makeAuthRequest(blockstack.generateAndStoreTransitKey(), redirectURI, manifestURI, scopes)
blockstack.redirectToSignInWithAuthRequest(authRequest, BLOCKSTACK_HOST)
})