I am trying to automatically clear my browser history, but I have no idea where the Firefox button is.
Do you have the menu bar with names like File and Edit visible?
You get the orange Firefox menu button if the menu bar is hidden.
Press the F10 key or tap the Alt key to bring up the "Menu Bar" temporarily if the menu bar is hidden.
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.