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diff --git a/editor/libeditor/tests/test_bug645914.html b/editor/libeditor/tests/test_bug645914.html
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+++ b/editor/libeditor/tests/test_bug645914.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=645914
+-->
+<head>
+  <title>Test for Bug 645914</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=645914">Mozilla Bug 645914</a>
+<p id="display"></p>
+<div id="content">
+<textarea>foo
+bar</textarea>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 645914 **/
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  SpecialPowers.pushPrefEnv({"set": [["layout.word_select.eat_space_to_next_word", true],
+                                     ["browser.triple_click_selects_paragraph", false]]}, startTest);
+});
+function startTest() {
+  var textarea = document.querySelector("textarea");
+  textarea.selectionStart = textarea.selectionEnd = 0;
+
+  // Simulate a double click on foo
+  synthesizeMouse(textarea, 5, 5, {clickCount: 2});
+
+  ok(true, "Testing word selection");
+  is(textarea.selectionStart, 0, "The start of the selection should be at the beginning of the text");
+  is(textarea.selectionEnd, 3, "The end of the selection should not include a newline character");
+
+  textarea.selectionStart = textarea.selectionEnd = 0;
+
+  // Simulate a triple click on foo
+  synthesizeMouse(textarea, 5, 5, {clickCount: 3});
+
+  ok(true, "Testing line selection");
+  is(textarea.selectionStart, 0, "The start of the selection should be at the beginning of the text");
+  is(textarea.selectionEnd, 3, "The end of the selection should not include a newline character");
+
+  textarea.selectionStart = textarea.selectionEnd = 0;
+  textarea.value = "Very very long value which would eventually overflow the visible section of the textarea";
+
+  // Simulate a quadruple click on Very
+  synthesizeMouse(textarea, 5, 5, {clickCount: 4});
+
+  ok(true, "Testing paragraph selection");
+  is(textarea.selectionStart, 0, "The start of the selection should be at the beginning of the text");
+  is(textarea.selectionEnd, textarea.value.length, "The end of the selection should be the end of the paragraph");
+
+  SimpleTest.finish();
+}
+</script>
+</pre>
+</body>
+</html>