diff -r 000000000000 -r 6474c204b198 modules/libjar/zipwriter/test/unit/test_bug446708.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libjar/zipwriter/test/unit/test_bug446708.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,37 @@
+function run_test() {
+  var testBundle = do_get_file("data/test_bug446708");
+
+  RecursivelyZipDirectory(testBundle);
+}
+
+// Add |file| to the zip. |path| is the current path for the file.
+function AddToZip(zipWriter, path, file)
+{
+  var currentPath = path + file.leafName;
+  
+  if (file.isDirectory()) {
+    currentPath += "/";
+  }
+  
+  // THIS IS WHERE THE ERROR OCCURS, FOR THE FILE "st14-1.tiff" IN "test_bug446708"
+  zipWriter.addEntryFile(currentPath, Ci.nsIZipWriter.COMPRESSION_DEFAULT, file, false);
+  
+  // if it's a dir, continue adding its contents recursively...
+  if (file.isDirectory()) {
+    var entries = file.QueryInterface(Components.interfaces.nsIFile).directoryEntries;
+    while (entries.hasMoreElements()) {
+      var entry = entries.getNext().QueryInterface(Components.interfaces.nsIFile);
+      AddToZip(zipWriter, currentPath, entry);
+    }
+  }
+  
+  // ...otherwise, we're done
+}
+
+function RecursivelyZipDirectory(bundle)
+{
+  zipW.open(tmpFile, PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE);
+  AddToZip(zipW, "", bundle); 
+  zipW.close();
+}
+