Hi, not clearly understanding what is going on yet nor what your out come looks like. Yes you get a list, what did you have before, previews ? If Click one on the list you would switch to that tab. Also if had Preview Checked in Options --> Tabs --> Show tab previews in the Windows taskbar and click a preview it would open the Tab. Once you get too many tabs open it will always switch to list mode. You would need to alter your your Display and Scale the screen to a different size to look for a 2nd instance of Firefox in the Task Bar. This can be done in Windows 10 or from your Video Card Software Control Panel. Fyi : all the the things to the right side of the Task Bar except time can be dragged and dropped into the up arrow by the question mark (Help). Please expand further on this issue and more detail in what your expected out come is if have not addressed the issue please.