Backspace/Delete ⌫ no longer works as a back button in Safari 6.
How to make the Backspace key to take me to the previous page in Safari 6?
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I actually asked a similar question (but more broad so this isn't a duplicate). I got this as an answer (it works, I tested it):
Write the below line in terminal:
defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2BackspaceKeyNavigationEnabled -bool YES
Then restart Safari.
Hope this helps!
Apple removed the backspace (probably to prevent users that wanted to edit a form field to accidentally go to the previous page)
You've got a number of options:
Just want to leave this here for when someone stumbles on this topic through a Google search (as I did) with the opposite problem and wants to DISABLE the backspace key (that was added back again in later versions of Safari). I managed to fix it using the following key in the Safari prefs list to map it to something that doesn't reload a page. I used "Export as PDF…" since I never use that, and certainly with a keyboard shortcut, but you can use any menu item that you never use.
defaults write com.apple.Safari NSUserKeyEquivalents -dict-add "Export as PDF…" "⌫"