--- a/toolkit/mozapps/extensions/content/extensions.js
+++ b/toolkit/mozapps/extensions/content/extensions.js
@@ -1377,17 +1377,17 @@ var gViewController = {
         const nsIFilePicker = Ci.nsIFilePicker;
         var fp = Cc["@mozilla.org/filepicker;1"]
                    .createInstance(nsIFilePicker);
         fp.init(window,
                 gStrings.ext.GetStringFromName("installFromFile.dialogTitle"),
                 nsIFilePicker.modeOpenMultiple);
         try {
           fp.appendFilter(gStrings.ext.GetStringFromName("installFromFile.filterName"),
-                          "*.xpi;*.jar");
+                          "*.xpi;*.jar;*.zip");
           fp.appendFilters(nsIFilePicker.filterAll);
         } catch (e) { }
 
         if (fp.show() != nsIFilePicker.returnOK)
           return;
 
         let browser = getBrowserElement();
         let files = fp.files;