Google Auth login fails in Firefox

[aardvarkk]

I set up a Heroku deployment of Accent and things seem to be working reasonably well in Chrome. In Firefox, however, when I click "Login with Google", the popup appears as expected (and closes when I select which account to use), but then... nothing happens back on the original page. I took a look at the console and found an error that triggered on each login attempt:

popup_closed_by_user

The error is being fired from the following function area (in the minified JS):

this.session.googleAuth.attachClickHandler(t,{},
  function(t){
    return e._authSuccess(t)
  },
  function(e){
    return window.console.error(e)
})

This is how the console looks after several attempts:

Not sure what other info I can provide. For now I can work around this by just using Chrome for logging in, it's just not my primary browser. I'm currently using Firefox Quantum v60.0.

[simonprev]

Are you sure you don’t have a browser extension that blocks Google scripts like AdBlocker, uBlock, Ghostery…?

The popup_closed_by_user is always caused by this.