Instructions: Run Chrome or Firefox in private browsing mode:
Private mode will not save cookies or any personal information on your computer. Autofill, passwords, history, or any type of cached information will be temporarily disabled.
In Firefox click the menu button at the upper right, select "New Private Window" (see below)
In Chrome click the settings icon (3 vertical dots) at the upper right, select "New Incognito Window" (see below)
Create a private mode desktop shortcut. Instructions: