diff --git a/xulmus/content/config.js b/xulmus/content/config.js
index 48b90fad..30ed2050 100644
--- a/xulmus/content/config.js
+++ b/xulmus/content/config.js
@@ -169,23 +169,6 @@ const Config = Module("config", ConfigBase, {
     }
 }, {
 
-    // TODO: support 'nrformats'? -> probably not worth it --mst
-    incrementURL: function (count) {
-        let matches = buffer.URL.match(/(.*?)(\d+)(\D*)$/);
-        if (!matches)
-            return void liberator.beep();
-
-        let [, pre, number, post] = matches;
-        let newNumber = parseInt(number, 10) + count;
-        let newNumberStr = String(newNumber > 0 ? newNumber : 0);
-        if (number.match(/^0/)) { // add 0009<C-a> should become 0010
-            while (newNumberStr.length < number.length)
-                newNumberStr = "0" + newNumberStr;
-        }
-
-        liberator.open(pre + newNumberStr + post);
-    },
-
     showServicePane: function (value) {
         const key = "splitter.servicepane_splitter.was_collapsed";
         gServicePane.open = value;