If a user is in Firefox 57 and opens the webui for homeassistant (an opensource home automation system), the page loads as blank unless LastPass is disabled. Then it loads correctly. This bug does not affect Chrome (or Chromium, the open source version). This bug has been replicated by users and developers on the homeassistant.io forum.
Because the initial page that causes the problem is a redirect, I am not able to catch it's source code for you. If someone wants to guide me on how to do it, I will be glad to do whatever is necessary to do the capture for you.
