The Tor Browser / file revision

 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();

 }