Hi there! I am trying to set a default webpage for the sidebar. has anyone had success doing this? Basically, my ultimate goal is to show two different websites side-by-side when firefox starts. One is a secure site with a login, the other is a generic static HTML page. I've had success with userChrome.css in terms of styling the sidebar, but can't seem to make it open a specific URL to begin with. I'm using Firefox Quantum 68.0 in Ubuntu 18.04.2. Thanks in advance for any insight you can share!