Firefox: How to disable "delete-key goes back"? When I'm working in Firefox, I often accidentally close a tab go-back-in-history when I press the Delete key.

(For example, if I'm in Google Drive, and highlight a file, and then press Delete, the tab closes - instead of deleting the file!)

Is there a way to turn this off? I've dug through about:config and didn't see anything promising.

Update:
I made a mistake in my original question: Firefox is going back when I hit Delete, not closing the tab.
Now that I realized it was "go back" instead of "close tab" - the answer can be found here:


  You can set this pref to 2 on the about:config page to disable the
  backspace_action. browser.backspace_action = 2