diff -r 000000000000 -r 6474c204b198 toolkit/crashreporter/KeyValueParser.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/crashreporter/KeyValueParser.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+Components.utils.import("resource://gre/modules/Services.jsm");
+
+this.EXPORTED_SYMBOLS = [
+  "parseKeyValuePairs",
+  "parseKeyValuePairsFromFile"
+];
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+
+this.parseKeyValuePairs = function parseKeyValuePairs(text) {
+  let lines = text.split('\n');
+  let data = {};
+  for (let i = 0; i < lines.length; i++) {
+    if (lines[i] == '')
+      continue;
+
+    // can't just .split() because the value might contain = characters
+    let eq = lines[i].indexOf('=');
+    if (eq != -1) {
+      let [key, value] = [lines[i].substring(0, eq),
+                          lines[i].substring(eq + 1)];
+      if (key && value)
+        data[key] = value.replace(/\\n/g, "\n").replace(/\\\\/g, "\\");
+    }
+  }
+  return data;
+}
+
+this.parseKeyValuePairsFromFile = function parseKeyValuePairsFromFile(file) {
+  let fstream = Cc["@mozilla.org/network/file-input-stream;1"].
+                createInstance(Ci.nsIFileInputStream);
+  fstream.init(file, -1, 0, 0);
+  let is = Cc["@mozilla.org/intl/converter-input-stream;1"].
+           createInstance(Ci.nsIConverterInputStream);
+  is.init(fstream, "UTF-8", 1024, Ci.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER);
+  let str = {};
+  let contents = '';
+  while (is.readString(4096, str) != 0) {
+    contents += str.value;
+  }
+  is.close();
+  fstream.close();
+  return parseKeyValuePairs(contents);
+}