Hi, I'm using the latest firefox version 89.0.2. There's a large tab bar at the top. I never use tabs. Safari doesn't show the tab bar unless multiple tabs are being used. This leaves more space to show webpages. I'd like to hide the tab bar permanently or when only one page/tab is used. I guess that means the red, yellow and green mac circles in the upper left would have to be moved to the lower bar, by shifting the back and forward arrows slightly to the right, as is done on Safari. I looked online for suggestions. chrome.css files were mentioned. But they didn't explain what those were or how to create/access them. So the guidance was not helpful to those who didn't understand those files, like me. Can you please let me know how to hide the tab bar? Based on all the comments I saw on threads, it seems many others think the tab bar wastes space. It would be great if Firefox preferences provided an easy option for hiding the tab bar. Thanks, Frank