Hello! I have recently installed Xubuntu Focal Fossa, and noticed that Firefox became slow along the way. At first, I didn't know what was the reason, but now, after having purged it and reinstalled it again for the second time, I am pretty sure that it is disabling the title bar which is causing the problem. Enabling it again and restarting the browser makes everything smooth once more. Is there a solution to this? Thank you very much!