This post will show you how to enable the Backspace Key to go back in Firefox.
- Open Mozilla Firefox.
- Type about:config in the address bar and press the Enter key.
- Click on Accept the Risk and Continue on the Proceed with Caution page.
- Type browser.backspace_action in the search box.
- Double-click on the browser.backspace_action parameter to set its value to 0
Note that the browser.backspace_action parameter supports the following values.
0 = goes Back/Forward
1 = acts like PgUp/PgDown
2 = disable the key (used by default in Firefox 86).
This change will align the Firefox behavior on Windows and macOS with how it works in Linux. On Linux, the backspace key is already disabled for quite a long time.
That's it.