Return Safari 6 Delete Key Functionality to Go Back a Page
Safari 6 changed the longstanding behavior of the Delete key, which used to navigate back a page when pressed but now does nothing. Instead, navigating web pages forward and backward is done through Command [ and Command ].
If you’d like to return the back-a-page navigation behavior to the Delete key within Safari, you can do so with a defaults write command.
defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2BackspaceKeyNavigationEnabled -bool YES
Open any web page, click forward a page, then hit the Delete key to confirm the change worked. If for some reason it didn’t, it’s probably a result of the unusually long defaults write command being entered improperly.
If you want to revert to the default Safari 6 behavior and remove the Backspace key navigation support, change the -bool switch from YES to NO, and then relaunch Safari:
defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2BackspaceKeyNavigationEnabled -bool NO
The latest version of Safari introduced some other controversial changes too, including the removal of the RSS feed button (you can add it back with an extension) and removal of RSS support in general, requiring the use of a third party reading app instead.
This works for Safari in both OS X Lion and Mountain Lion, Mavericks, etc. This great tip comes to us from MacRumors forums, it should apply going forward to all versions of Safari in OS X too. Let us know in the comments what works for you.