[PALEMOON] Reimplemented "Time Zone Information"

https://github.com/MoonchildProductions/Pale-Moon/issues/593
Issue #121

application/palemoon/app/profile/palemoon.js

@@ -80,6 +80,14 @@ pref("browser.slowstartup.help.url", "http://www.palemoon.org/support/slowstartu
 // on a network error page (e.g. cert error)
 pref("browser.escape_to_blank", false);
 
+#ifdef XP_WIN
+// Save internet zone information on downloaded files:
+// 0 => Never
+// 1 => Always
+// 2 => Use system setting
+pref("browser.download.saveZoneInformation", 2);
+#endif
+
 // The minimum delay in seconds for the timer to fire.
 // default=2 minutes
 pref("app.update.timerMinimumDelay", 120);

toolkit/components/jsdownloads/src/DownloadIntegration.jsm

@@ -530,6 +530,37 @@ this.DownloadIntegration = {
    * @return true if files should be marked
    */
   _shouldSaveZoneInformation() {
+#ifdef MC_PALEMOON
+    let zonePref = 2;
+    try {
+      zonePref = Services.prefs.getIntPref("browser.download.saveZoneInformation");
+    } catch (ex) {}
+    
+    switch (zonePref) {
+      case 0: // Never
+              return false;
+      case 1: // Always
+              return true;
+      case 2: // System-defined
+              let key = Cc["@mozilla.org/windows-registry-key;1"]
+                       .createInstance(Ci.nsIWindowsRegKey);
+              try {
+                key.open(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
+                         "Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Attachments",
+                         Ci.nsIWindowsRegKey.ACCESS_QUERY_VALUE);
+                try {
+                  return key.readIntValue("SaveZoneInformation") != 1;
+                } finally {
+                  key.close();
+                }
+              } catch (ex) {
+                // If the key is not present, files should be marked by default.
+                return true;
+              }
+      default: // Invalid pref value defaults marking files.
+               return true;
+    }
+#else
     let key = Cc["@mozilla.org/windows-registry-key;1"]
                 .createInstance(Ci.nsIWindowsRegKey);
     try {
@@ -545,6 +576,7 @@ this.DownloadIntegration = {
       // If the key is not present, files should be marked by default.
       return true;
     }
+#endif
   },
 #endif