Kwatanta Nazarce-nazarce

On Windows 7, Microsoft update KB4474419 is needed to install Firefox 100 or above without any issues. Learn more.

Beginning with [[Find what version of Firefox you are using|Firefox version]] 100, Microsoft security update KB4474419 is required for successful installation of Firefox on a computer running the Windows 7 operating system. For details about this Windows update, visit the [https://support.microsoft.com/en-us/help/4474419/sha-2-code-signing-support-update Microsoft Technical Support website]. {note}'''Note:''' If you install Firefox without Microsoft security update KB4474419, you may notice an orange or yellow warning message in the UAC (User Account Control) prompt, indicating that the installer is not properly signed. The Firefox installation, however, will complete and Firefox will work. <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1745467#c45 https://support.mozilla.org/en-US/questions/1378973 -->{/note} Most Windows 7 users will have Microsoft update KB4474419 already installed, since it was an automatic Windows update. To make sure this update is installed on your computer: # Click the Windows Start button or press the Windows key {key [[Image:Windows Key]]}. # In the Start Menu, click {menu Control Panel}. # In the Control Panel window, click the '''Programs''' link, then click '''Programs and Features'''. # Click on {menu View installed updates} and wait for the list to be filled in. # Search for KB4474419 using the search field in the upper right corner. #;[[Image:Win7InstalledUpdatesKB4474419]] If ''Security Update for Microsoft Windows (KB4474419)'' is listed, you can install Firefox without any issues. =Related content= [[Firefox users on Windows 7, 8 and 8.1 moving to Extended Support Release]]