diff -r 000000000000 -r 6474c204b198 browser/devtools/styleeditor/test/browser_styleeditor_selectstylesheet.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/styleeditor/test/browser_styleeditor_selectstylesheet.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TESTCASE_URI = TEST_BASE_HTTPS + "simple.html";
+const NEW_URI = TEST_BASE_HTTPS + "media.html";
+
+const LINE_NO = 5;
+const COL_NO  = 0;
+
+let gContentWin;
+let gUI;
+
+function test()
+{
+  waitForExplicitFinish();
+
+  addTabAndOpenStyleEditors(2, function(panel) {
+    gContentWin = gBrowser.selectedTab.linkedBrowser.contentWindow.wrappedJSObject;
+    gUI = panel.UI;
+    gUI.editors[0].getSourceEditor().then(runTests);
+  });
+
+  content.location = TESTCASE_URI;
+}
+
+function runTests()
+{
+  let count = 0;
+
+  // Make sure Editor doesn't go into an infinite loop when
+  // column isn't passed. See bug 941018.
+  gUI.once("editor-selected", (event, editor) => {
+    editor.getSourceEditor().then(() => {
+      is(gUI.selectedEditor, gUI.editors[1], "second editor is selected");
+      let {line, ch} = gUI.selectedEditor.sourceEditor.getCursor();
+      
+      is(line, LINE_NO, "correct line selected");
+      is(ch, COL_NO, "correct column selected");
+
+      gUI = null;
+      finish();
+    });
+  });
+
+  gUI.selectStyleSheet(gUI.editors[1].styleSheet.href, LINE_NO);
+}
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