Fix some non-working 'autocomplete' uses.

common/content/bookmarks.js

@@ -708,6 +708,9 @@ var Bookmarks = Module("bookmarks", {
                 ctxt.compare = CompletionContext.Sort.unsorted;
                 ctxt.filterFunc = null;
 
+                if (ctxt.waitingForTab)
+                    return;
+
                 let words = ctxt.filter.toLowerCase().split(/\s+/g);
                 ctxt.completions = ctxt.completions.filter(function (i) words.every(function (w) i.toLowerCase().indexOf(w) >= 0));