diff -r 000000000000 -r 6474c204b198 browser/devtools/sourceeditor/codemirror/closebrackets.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/sourceeditor/codemirror/closebrackets.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,123 @@
+(function(mod) {
+  if (typeof exports == "object" && typeof module == "object") // CommonJS
+    mod(require("../../lib/codemirror"));
+  else if (typeof define == "function" && define.amd) // AMD
+    define(["../../lib/codemirror"], mod);
+  else // Plain browser env
+    mod(CodeMirror);
+})(function(CodeMirror) {
+  var DEFAULT_BRACKETS = "()[]{}''\"\"";
+  var DEFAULT_EXPLODE_ON_ENTER = "[]{}";
+  var SPACE_CHAR_REGEX = /\s/;
+
+  CodeMirror.defineOption("autoCloseBrackets", false, function(cm, val, old) {
+    if (old != CodeMirror.Init && old)
+      cm.removeKeyMap("autoCloseBrackets");
+    if (!val) return;
+    var pairs = DEFAULT_BRACKETS, explode = DEFAULT_EXPLODE_ON_ENTER;
+    if (typeof val == "string") pairs = val;
+    else if (typeof val == "object") {
+      if (val.pairs != null) pairs = val.pairs;
+      if (val.explode != null) explode = val.explode;
+    }
+    var map = buildKeymap(pairs);
+    if (explode) map.Enter = buildExplodeHandler(explode);
+    cm.addKeyMap(map);
+  });
+
+  function charsAround(cm, pos) {
+    var str = cm.getRange(CodeMirror.Pos(pos.line, pos.ch - 1),
+                          CodeMirror.Pos(pos.line, pos.ch + 1));
+    return str.length == 2 ? str : null;
+  }
+
+  function buildKeymap(pairs) {
+    var map = {
+      name : "autoCloseBrackets",
+      Backspace: function(cm) {
+        if (cm.getOption("disableInput")) return CodeMirror.Pass;
+        var ranges = cm.listSelections();
+        for (var i = 0; i < ranges.length; i++) {
+          if (!ranges[i].empty()) return CodeMirror.Pass;
+          var around = charsAround(cm, ranges[i].head);
+          if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
+        }
+        for (var i = ranges.length - 1; i >= 0; i--) {
+          var cur = ranges[i].head;
+          cm.replaceRange("", CodeMirror.Pos(cur.line, cur.ch - 1), CodeMirror.Pos(cur.line, cur.ch + 1));
+        }
+      }
+    };
+    var closingBrackets = "";
+    for (var i = 0; i < pairs.length; i += 2) (function(left, right) {
+      if (left != right) closingBrackets += right;
+      map["'" + left + "'"] = function(cm) {
+        if (cm.getOption("disableInput")) return CodeMirror.Pass;
+        var ranges = cm.listSelections(), type, next;
+        for (var i = 0; i < ranges.length; i++) {
+          var range = ranges[i], cur = range.head, curType;
+          if (left == "'" && cm.getTokenTypeAt(cur) == "comment")
+            return CodeMirror.Pass;
+          var next = cm.getRange(cur, CodeMirror.Pos(cur.line, cur.ch + 1));
+          if (!range.empty())
+            curType = "surround";
+          else if (left == right && next == right)
+            curType = "skip";
+          else if (left == right && CodeMirror.isWordChar(next))
+            return CodeMirror.Pass;
+          else if (cm.getLine(cur.line).length == cur.ch || closingBrackets.indexOf(next) >= 0 || SPACE_CHAR_REGEX.test(next))
+            curType = "both";
+          else
+            return CodeMirror.Pass;
+          if (!type) type = curType;
+          else if (type != curType) return CodeMirror.Pass;
+        }
+
+        if (type == "skip") {
+          cm.execCommand("goCharRight");
+        } else if (type == "surround") {
+          var sels = cm.getSelections();
+          for (var i = 0; i < sels.length; i++)
+            sels[i] = left + sels[i] + right;
+          cm.replaceSelections(sels, "around");
+        } else if (type == "both") {
+          cm.replaceSelection(left + right, null);
+          cm.execCommand("goCharLeft");
+        }
+      };
+      if (left != right) map["'" + right + "'"] = function(cm) {
+        var ranges = cm.listSelections();
+        for (var i = 0; i < ranges.length; i++) {
+          var range = ranges[i];
+          if (!range.empty() ||
+              cm.getRange(range.head, CodeMirror.Pos(range.head.line, range.head.ch + 1)) != right)
+            return CodeMirror.Pass;
+        }
+        cm.execCommand("goCharRight");
+      };
+    })(pairs.charAt(i), pairs.charAt(i + 1));
+    return map;
+  }
+
+  function buildExplodeHandler(pairs) {
+    return function(cm) {
+      if (cm.getOption("disableInput")) return CodeMirror.Pass;
+      var ranges = cm.listSelections();
+      for (var i = 0; i < ranges.length; i++) {
+        if (!ranges[i].empty()) return CodeMirror.Pass;
+        var around = charsAround(cm, ranges[i].head);
+        if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
+      }
+      cm.operation(function() {
+        cm.replaceSelection("\n\n", null);
+        cm.execCommand("goCharLeft");
+        ranges = cm.listSelections();
+        for (var i = 0; i < ranges.length; i++) {
+          var line = ranges[i].head.line;
+          cm.indentLine(line, null, true);
+          cm.indentLine(line + 1, null, true);
+        }
+      });
+    };
+  }
+});