What version are you currently using?

A possible cause might be that you do not have write permissions for the Firefox program folder to install updates.<br /> On Windows updates are usually downloaded and installed via a special service that runs in the background and that has elevated permissions (you need to approve this once during the first installation of Firefox).<br /> You may only be able to check for updates when Firefox is started as Administrator (not recommended for security reasons).<br /> You can see the current Firefox version in Help > About and visiting this window should show a message when updates are available. *Tools > Options > Advanced > Update: "Use a background service to install updates" *https://support.mozilla.org/kb/what-mozilla-maintenance-service *https://wiki.mozilla.org/Windows_Service_Silent_Update