Option click to save links on mac (55686). r=timeless sr=alecf

modules/libpref/src/init/all.js

@@ -360,6 +360,7 @@ pref("security.xpconnect.plugin.unrestricted", true);
 pref("ui.key.accelKey", 17);
 pref("ui.key.menuAccessKey", 18);
 pref("ui.key.menuAccessKeyFocuses", false);
+pref("ui.key.saveLink.shift", true); // true = shift, false = meta
 
 // Middle-mouse handling
 pref("middlemouse.paste", false);

modules/libpref/src/mac/macprefs.js

@@ -24,6 +24,7 @@
 platform.mac = true;
 
 pref("browser.drag_out_of_frame_style", 1);
+pref("ui.key.saveLink.shift", false); // true = shift, false = meta
 
 pref("editor.use_html_editor",              false);
 pref("editor.use_image_editor",             false);

xpfe/communicator/resources/content/contentAreaClick.js

@@ -144,7 +144,17 @@
           event.preventBubble();
           return true;
         } 
-        if (event.shiftKey) {                                         // if shift is down
+        var saveModifier = true;
+        if (pref) {
+          try {
+            saveModifier = pref.GetBoolPref("ui.key.saveLink.shift");
+          }
+          catch {            
+          }
+        }
+        saveModifier = saveModifier ? event.shiftKey : event.metaKey;
+          
+        if (saveModifier) {                                           // if saveModifier is down
           savePage(href);                                             // save the link
           return true;
         }