when using an iPhonen how to view the previous page when browsing a web site

Every history stack starts at the tab creation point in time. Adding a "close and go back in the original tab" behavior is tracked in https://github.com/mozilla-mobile/firefox-ios/issues/15284

Thanks jbr. I admit to being a technological dunce and consequently don't know how to add a "close and go back in the original tab". Is there some way to add a back button or its equivalent? I think what you are telling me is that the page behavior is integral to the particular page as it is published and that Firefox is at its mercy. However that is not the case with the desktop version or other browsers. There has got to be a back-button function that works for all pages somewhere in the app. I just can't find it.