I can't back up to a previous page with newer version of Firefox. I have to end session and come back in on new screen.. Very annoying. ds

I'm researching coffee machines on my older Compaq laptop, using Firefox as browser. After clicking on a hotlink and being moved to a different info screen, I want to return to the original screen. Can't get back. No "back button" on newer version of Firefox. Very time consuming to have to "x" out and come in again. ds