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.
Firefox:
In Firefox click the menu button at the upper right, select "New Private Window" (see below)
Chrome:
In Chrome click the settings icon (3 vertical dots) at the upper right, select "New Incognito Window" (see below)
Optional:
Create a private mode desktop shortcut. Instructions: