--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -685,21 +685,17 @@ pref("browser.preferences.instantApply",
 
 pref("browser.download.show_plugins_in_list", true);
 pref("browser.download.hide_plugins_without_extensions", true);
 
 // Backspace and Shift+Backspace behavior
 // 0 goes Back/Forward
 // 1 act like PgUp/PgDown
 // 2 and other values, nothing
-#ifdef UNIX_BUT_NOT_MAC
-pref("browser.backspace_action", 2);
-#else
 pref("browser.backspace_action", 0);
-#endif
 
 // this will automatically enable inline spellchecking (if it is available) for
 // editable elements in HTML
 // 0 = spellcheck nothing
 // 1 = check multi-line controls [default]
 // 2 = check multi/single line controls
 pref("layout.spellcheckDefault", 1);