Uploadsecure.xyz is a very dangerous domain that currently attacks Mozilla Firefox browser. This domain will try to force you to download and install some suspicious extension (add-on) into your browser. After that your Mozilla Firefox will be hijacked. Its home page and default search engine settings will be changed into some totally weird settings. Obviously, you should not trust any of such deceitful notifications by uploadsecure.xyz site, but rather carefully follow this step-by-step guide explaining how to properly fix your system that has been infected by adware.