Forum communautaire Firefox pour Android

Usually happens with youtube embed links, not sure if it happens with other(non-embed/other website) links, but it will ask me to open with app or in browser, and can't be cancelled with back button, only home button. when I press home button and reopen the app the embed will disappear in the page

http://americafirst.com/, Firefox used to be able to resolve this to a secure site and open it. For months, it just stalls and stays blank. What is the problem? What has changed?