I'm a big fan of using the keyboard for tasks instead of always relying
   on the mouse. In Ubuntu, Firefox wasn't honouring the use of backspace
   to take me back a page. I found a [1]fix here that surprisingly still
   works.

   In short, open a new tab and type
about:config

   Search for backspace. Double click on "browser.backspace_action" and
   change the value to 0.
     __________________________________________________________________

   My original entry is here: [2]Fix Backspace to go Back one Page in
   Firefox 2 and Above. It posted Sun, 02 Dec 2012 14:46:31 +0000.
   Filed under: technology, firefox, Ubuntu,

References

   1. http://embraceubuntu.com/2006/12/21/fix-firefox-backspace-to-take-you-to-the-previous-page/
   2. https://www.prjorgensen.com/2012/12/02/fix-backspace-to-go-back-one-page-in-firefox-2-and-above/