Hi kandbr, I'm not sure what you're seeing. Is the problem with a change to the appearance of your startup/home page, or the way the Firefox window is set up? Firefox either can devote the entire content area to just the page you requested, or it can show a sidebar (for example, a Bookmarks sidebar), and/or it can show a developer tools panel. So those are some possible things you might be seeing. If you can share a screenshot, that might help us understand the situation better. This article has tips on capturing screenshots, but please cut out or blur anything sensitive in the image file before attaching it to your reply: [[How do I create a screenshot of my problem?]]