Mozilla Firefox disables the browser backspace key to prevent users from accidentally losing data entered on forms.
In 2014, Google removed the ability to return to a previous page using the backspace key, as it could cause data lost on forms entered in the current page σελίδα.
It would be useful to determine how often backspace is used as a "back" action shortcut, so we can understand if we need to modify the UX in some way to avoid accidental loss of form data due to incorrect typing of the backspace key, ”Google Chrome developers reported in 2014.
More than six years later, Mozilla finally decided to implement this change after Firefox and Internet Explorer 11 are the only browsers that support this keyboard shortcut.
“To avoid data loss when filling out the forms, the key Backspace as the navigation shortcut for "Return to a Page" is now switched off. To re-enable the Backspace keyboard shortcut, you can change the preference about: config browser.backspace_action to 0. You can also use the recommended shortcut Alt + Left arrow (Command + Right arrow on Mac), ”Pascal Chevrel added in the release notes of Firefox Nightly 86.0a1.
According to TechDows, which first reported the change, the change is now available in the latest version of Firefox that users are trying out.
For those who wish to continue using the backspace key, you can re-enable it in about: config using the following steps:
1. Enter about: config in the Firefox address bar.
2. Look for it browser.backspace_action and change its value to '0'.
Once the setting is enabled, you can use the backspace key to return to the previous Firefox page.
Source of information: bleepingcomputer.com