Are you using a Proxy ? If Yes, is the proxy. Please make sure Firefox is set to No Proxy. Is this on a normal HTTP page or just happens on HTTPS pages ? If this issue is effecting Edge it could be Network issues that you are on. It could be your Network Driver. Microsoft in Windows 10 is known to change your driver to their drivers. https://www.howtogeek.com/263851/how-to-prevent-windows-from-automatically-updating-specific-drivers/ You can check in the Device Manager and see if it is using the proper driver or if it has been changed to a MS Driver. If it has download the proper driver and install it then stop MS from changing it again. If it is a system issue : Repair System Registry and Files Run the Windows Deployment Image Servicing and Management (DISM) and System File Checker (SFC) tools as Administrator. The DISM and SFC tools scan the integrity of the Windows image and all protected system files replaces corrupted, damaged and incorrect versions. Windows 10 To run the DISM command use the Windows key + X keyboard shortcut to open the Power User menu, then select Command Prompt (Admin). Type "DISM /Online /Cleanup-Image /RestoreHealth" (without quotes or copy/paste) and press Enter. While running DISM you may notice the process will appear to pause at 20%. After a few minutes the operation will continue. (FOR DOING Above & Below - WINDOWS All OTHER VERSIONS - Use Search To Find Command Prompt ** Enter CMD.exe to Find COMMAND PROMPT Then Right Click & RUN AS ADMIN) To run the SFC command use the Windows key + X keyboard shortcut to open the Power User menu and select Command Prompt (Admin). Type "SFC /SCANNOW" (without quotes or copy/paste) and press Enter. For more information on using SFC, please refer to the Microsoft KB: Use the System File Checker tool to repair missing or corrupted system files Please let us know if this solved your issue or if need further assistance.