Hi there! It sounds like you're experiencing an issue with Firefox not opening its window when you launch the browser. This could be due to a couple of reasons. First, try restarting your computer to see if that resolves the problem. If not, it could be caused by some add-ons or extensions conflicting with Firefox. You can try starting Firefox in Safe Mode by holding down the Shift key while launching it. If the window opens in Safe Mode, then an add-on might be the culprit. You can disable add-ons one by one to find the problematic one. Another thing to try is creating a new Firefox profile, which might fix any profile-related issues. To do that, close Firefox and open it using the "Run" command (press Win + R) and type "firefox.exe -P" without quotes. Create a new profile and see if that helps. If the problem persists, you can also try reinstalling Firefox. Give these steps a try, and hopefully, it will resolve the issue for you. Let me know how it goes!