[Pale-Moon] Issue #1967 - Enable prefetching and provide interface.

- Expose network.dns.disablePrefetch to UI.
- Set the pref to false by default (DNS prefetch enabled)

Resolves #1967

application/palemoon/app/profile/palemoon.js

@@ -570,8 +570,8 @@ pref("network.http.pipelining.ssl", true);
 pref("network.predictor.enabled", false);
 pref("network.prefetch-next", false);
 
-// Disable DNS prefetching
-pref("network.dns.disablePrefetch", true);
+// Enable DNS prefetching
+pref("network.dns.disablePrefetch", false);
 
 // Tune DNS lookups
 pref("network.dnsCacheEntries", 800);

application/palemoon/components/preferences/advanced.xul

@@ -52,6 +52,9 @@
       <preference id="pref.general.captiveportal" name="network.captive-portal-service.enabled" type="bool"/>
 
       <!-- Network tab -->
+      <preference id="network.dns.prefetch"            name="network.dns.disablePrefetch"     type="bool"   inverted="true"/>
+      
+      <!-- Cache tab -->
       <preference id="browser.cache.disk.capacity"     name="browser.cache.disk.capacity"     type="int"/>
 
       <preference id="browser.cache.disk.smart_size.enabled"
@@ -124,6 +127,7 @@
       <tabs id="tabsElement">
         <tab id="generalTab" label="&generalTab.label;" helpTopic="prefs-advanced-general"/>
         <tab id="networkTab" label="&networkTab.label;" helpTopic="prefs-advanced-network"/>
+        <tab id="cacheTab" label="&cacheTab.label;" helpTopic="prefs-advanced-cache"/>
         <tab id="updateTab" label="&updateTab.label;"  helpTopic="prefs-advanced-update"/>
         <tab id="encryptionTab" label="&certificateTab.label;" helpTopic="prefs-advanced-encryption"/>
         <tab id="scrollparamTab" label="&scrollparamTab.label;" helpTopic="prefs-advanced-scrollparams"/>      
@@ -221,7 +225,6 @@
 
         <!-- Network -->
         <tabpanel id="networkPanel" orient="vertical">
-
           <!-- Connection -->
           <groupbox id="connectionGroup">
             <caption label="&connection.label;"/>
@@ -233,8 +236,20 @@
                       oncommand="gAdvancedPane.showConnections();"/>
             </hbox>
           </groupbox>
+          
+          <!-- DNS settings -->
+          <groupbox id="DNSGroup">
+            <caption label="&DNS.label;"/>
+            <checkbox id="enableDNSPrefetch"
+                      label="&enableDNSPrefetch.label;"
+                      accesskey="&enableDNSPrefetch.accesskey;"
+                      preference="network.dns.prefetch"/>
+          </groupbox>
+        </tabpanel>
+
+        <!-- Cache -->
+        <tabpanel id="cachePanel" orient="vertical">
 
-          <!-- Cache -->
           <groupbox id="cacheGroup">
             <caption label="&httpCache.label;"/>
 

application/palemoon/locales/en-US/chrome/browser/preferences/advanced.dtd

@@ -61,6 +61,12 @@
 <!ENTITY connectionSettings.label        "Settings…">
 <!ENTITY connectionSettings.accesskey    "e">
 
+<!ENTITY DNS.label                       "DNS">
+<!ENTITY enableDNSPrefetch.label         "Prefetch DNS lookups">
+<!ENTITY enableDNSPrefetch.accesskey     "P">
+
+<!ENTITY cacheTab.label                  "Cache">
+
 <!ENTITY httpCache.label                 "Cached Web Content">
 
 <!ENTITY offlineStorage2.label           "Offline Web Content and User Data">