actually install something from talkback.xpi

xpinstall/packager/unix/talkback.jst

@@ -1,13 +1,33 @@
-var err = initInstall("Quality Feedback Agent", "Quality Feedback Agent", "$Version$"); 
+var srDest = $SpaceRequired$;
+
+var err = initInstall("Quality Feedback Utility", "Quality Feedback Utility", "$Version$");
 logComment("initInstall: " + err);
 
-if (err==SUCCESS)
+var communicatorFolder = getFolder("Program");
+logComment("communicatorFolder: " + communicatorFolder);
+
+if (verifyDiskSpace(communicatorFolder, srDest))
 {
-    err = performInstall(); 
-    logComment("performInstall() returned: " + err);
+    err = addDirectory("Program",
+                       "$Version$",
+                       "bin",              // jar source folder 
+                       communicatorFolder, // target folder 
+                       "",                 // target subdir 
+                       true );             // force flag 
+
+    logComment("addDirectory() returned: " + err);
+
+    if (err==SUCCESS)
+    {
+            err = performInstall();
+            logComment("performInstall() returned: " + err);
+    }
+    else
+    {
+            cancelInstall(err);
+            logComment("cancelInstall() returned: " + err);
+    }
 }
 else
-{
-    cancelInstall(err);
-    logComment("cancelInstall() returned: " + err);
-}
+    cancelInstall(INSUFFICIENT_DISK_SPACE);
+