Hello To remove the empty frame around a window, you should disable Skeleton UI. #Type '''about:config''' in the address bar and press Enter. #Click "'''Accept the Risk and Continue".''' #Search for '''browser.startup.preXulSkeletonUI. #'''Double-click it to set it to false. '''What is skeleton UI?''' Skeleton UI is a placeholder loading technique that mimics the structure of a page, using gray shapes to represent content while it loads. It improves user experience (UX) by providing a sense of progress, reducing perceived wait times, and signaling that data is fetching. If disabling it doesnt work, try these : #'''Disable Hardware Acceleration''' #'''Check Theme/Compatibility''' #'''Refresh Firefox'''