--- mozilla/browser/base/content/browser.js	2006-05-03 02:45:14.000000000 +0200
+++ mozilla/browser/base/content/browser.js	2006-06-30 00:59:24.000000000 +0200
@@ -1759,20 +1759,21 @@
   setTimeout(SearchLoadURL, 0, aURL, aInNewTab);
 }
 
-function SearchLoadURL(aURL, aInNewTab)
+function SearchLoadURL(aURL, aInNewTab, postData)
 {
   if (!aURL)
     return;
 
   if (gBrowser.localName == "tabbrowser" && aInNewTab) {
     content.focus();
-    var t = gBrowser.addTab(aURL, null); // open link in new tab
+    var t = gBrowser.addTab(aURL, null, null, postData); // open link in new tab
     gBrowser.selectedTab = t;
     if (gURLBar)
       gURLBar.value = aURL;
   }
-  else
-    loadURI(aURL, null, null);
+  else {
+    loadURI(aURL, null, postData);
+  }
   content.focus();
 }

--- mozilla/browser/base/content/search.xml	2006-06-30 02:01:32.000000000 +0200
+++ mozilla/browser/base/content/search.xml	2006-06-30 01:04:26.000000000 +0200
@@ -300,10 +300,18 @@
 
           var ISEARCHSVC = Components.classes["@mozilla.org/rdf/datasource;1?name=internetsearch"]
                                      .getService(Components.interfaces.nsIInternetSearchService);
+          var postData={value:""};
           //XXX Bug 269994: Add in dummy search text "ABC" if the field is empty to ensure a result
           var searchURL = ISEARCHSVC.GetInternetSearchURL(this.currentEngine,
                                        this.value? encodeURIComponent(this.value):"ABC", 
-                                       0, 0, {value:0});
+                                       0, 0, {value:0}, postData);
+          
+          if (postData.value && postData.value.length>0) {
+            postData = getPostDataStream(postData.value, " ", " ", "application/x-www-form-urlencoded");
+          }
+          else {
+            postData = null;
+          }
 
           // if the search box is empty, let's load the host
           if (!this.value) {
@@ -316,7 +324,7 @@
             } catch (ex) {}
           }
           var evt = aEvent || this.mEnterEvent;
-          SearchLoadURL(searchURL, (evt && evt.altKey));
+          SearchLoadURL(searchURL, (evt && evt.altKey), postData);
         ]]></body>
       </method>

--- mozilla/xpfe/components/search/public/nsISearchService.idl	2005-04-16 06:37:39.000000000 +0200
+++ mozilla/xpfe/components/search/public/nsISearchService.idl	2006-06-29 10:06:53.000000000 +0200
@@ -59,7 +59,8 @@
   const unsigned short kHaveNext = 1;
   const unsigned short kHavePrev = 2;
 
-  string      GetInternetSearchURL(in string searchEngineURI, in wstring searchStr, in short direction, in unsigned short pageNumber, out unsigned short whichButtons);
+//  string      GetInternetSearchURL(in string searchEngineURI, in wstring searchStr, in short direction, in unsigned short pageNumber, out unsigned short whichButtons);
+  string      GetInternetSearchURL(in string searchEngineURI, in wstring searchStr, in short direction, in unsigned short pageNumber, out unsigned short whichButtons, out string postData);
   void      RememberLastSearchText(in wstring escapedSearchStr);
   boolean      FindInternetSearchResults(in string url);
   void      Stop();

--- mozilla/xpfe/components/search/src/nsInternetSearchService.cpp	2006-02-23 05:30:19.000000000 +0100
+++ mozilla/xpfe/components/search/src/nsInternetSearchService.cpp	2006-06-29 10:31:52.000000000 +0200
@@ -2661,10 +2661,11 @@
 NS_IMETHODIMP
 InternetSearchDataSource::GetInternetSearchURL(const char *searchEngineURI,
   const PRUnichar *searchStr, PRInt16 direction, PRUint16 pageNumber, 
-  PRUint16 *whichButtons, char **resultURL)
+  PRUint16 *whichButtons, char **postData, char **resultURL)
 {
 	if (!resultURL)	return(NS_ERROR_NULL_POINTER);
 	*resultURL = nsnull;
+	if (postData) *postData = nsnull;
 
 	// if we haven't already, load in the engines
   if (!gEngineListBuilt)
@@ -2760,10 +2761,17 @@
 	    return(rv);
 	if (input.IsEmpty())				return(NS_ERROR_UNEXPECTED);
 
-	// we can only handle HTTP GET
-	if (!method.LowerCaseEqualsLiteral("get"))	return(NS_ERROR_UNEXPECTED);
-	// HTTP Get method support
-	action += input;
+	// we can only handle HTTP GET & POST
+    if (method.LowerCaseEqualsLiteral("get"))
+    {
+    	// HTTP Get method support
+    	action += input;
+    } else if (method.LowerCaseEqualsLiteral("post") && postData)
+    {
+        // HTTP Post method support
+        // skip leading '?' in url-encoded variables for post data:
+        *postData = ToNewCString( nsAutoString(input.get() + 1) );
+	} else return(NS_ERROR_UNEXPECTED);
 
 	// return a copy of the resulting search URL
 	*resultURL = ToNewCString(action);