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diff --git a/editor/libeditor/tests/test_selection_move_commands.html b/editor/libeditor/tests/test_selection_move_commands.html
new file mode 100644
index 0000000000..cb2f769a2a
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+++ b/editor/libeditor/tests/test_selection_move_commands.html
@@ -0,0 +1,225 @@
+<!doctype html>
+<title>Test for nsSelectionMoveCommands</title>
+<link rel=stylesheet href="/tests/SimpleTest/test.css">
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<script type="text/javascript" src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=454004">Mozilla Bug 454004</a>
+
+<iframe id="edit" width="200" height="100" src="about:blank"></iframe>
+
+<script>
+SimpleTest.waitForExplicitFinish();
+
+async function setup() {
+  await SpecialPowers.pushPrefEnv({set: [["general.smoothScroll", false]]});
+}
+
+async function* runTests() {
+  var e = document.getElementById("edit");
+  var doc = e.contentDocument;
+  var win = e.contentWindow;
+  var root = doc.documentElement;
+  var body = doc.body;
+
+  var sel = win.getSelection();
+
+  function testScrollCommand(cmd, expectTop) {
+    const { top } = root.getBoundingClientRect();
+
+    // XXX(krosylight): Android scrolls slightly more inside
+    // geckoview-test-verify-e10s CI job
+    const isAndroid = SpecialPowers.Services.appinfo.widgetToolkit == "android";
+    const delta = isAndroid ? .150 : 0;
+    isfuzzy(top, -expectTop, delta, cmd);
+  }
+
+  function testMoveCommand(cmd, expectNode, expectOffset) {
+    SpecialPowers.doCommand(window, cmd);
+    is(sel.isCollapsed, true, "collapsed after " + cmd);
+    is(sel.anchorNode, expectNode, "node after " + cmd);
+    is(sel.anchorOffset, expectOffset, "offset after " + cmd);
+  }
+
+  function findChildNum(element, child) {
+    var i = 0;
+    var n = element.firstChild;
+    while (n && n != child) {
+      n = n.nextSibling;
+      ++i;
+    }
+    if (!n)
+      return -1;
+    return i;
+  }
+
+  function testPageMoveCommand(cmd, expectOffset) {
+    SpecialPowers.doCommand(window, cmd);
+    is(sel.isCollapsed, true, "collapsed after " + cmd);
+    is(sel.anchorOffset, expectOffset, "offset after " + cmd);
+    return findChildNum(body, sel.anchorNode);
+  }
+
+  function testSelectCommand(cmd, expectNode, expectOffset) {
+    var anchorNode = sel.anchorNode;
+    var anchorOffset = sel.anchorOffset;
+    SpecialPowers.doCommand(window, cmd);
+    is(sel.isCollapsed, false, "not collapsed after " + cmd);
+    is(sel.anchorNode, anchorNode, "anchor not moved after " + cmd);
+    is(sel.anchorOffset, anchorOffset, "anchor not moved after " + cmd);
+    is(sel.focusNode, expectNode, "node after " + cmd);
+    is(sel.focusOffset, expectOffset, "offset after " + cmd);
+  }
+
+  function testPageSelectCommand(cmd, expectOffset) {
+    var anchorNode = sel.anchorNode;
+    var anchorOffset = sel.anchorOffset;
+    SpecialPowers.doCommand(window, cmd);
+    is(sel.isCollapsed, false, "not collapsed after " + cmd);
+    is(sel.anchorNode, anchorNode, "anchor not moved after " + cmd);
+    is(sel.anchorOffset, anchorOffset, "anchor not moved after " + cmd);
+    is(sel.focusOffset, expectOffset, "offset after " + cmd);
+    return findChildNum(body, sel.focusNode);
+  }
+
+  function node(i) {
+    var n = body.firstChild;
+    while (i > 0) {
+      n = n.nextSibling;
+      --i;
+    }
+    return n;
+  }
+
+  SpecialPowers.doCommand(window, "cmd_scrollBottom");
+  yield;
+  testScrollCommand("cmd_scrollBottom", root.scrollHeight - 100);
+  SpecialPowers.doCommand(window, "cmd_scrollTop");
+  yield;
+  testScrollCommand("cmd_scrollTop", 0);
+
+  SpecialPowers.doCommand(window, "cmd_scrollPageDown");
+  yield;
+  var pageHeight = -root.getBoundingClientRect().top;
+  ok(pageHeight > 0, "cmd_scrollPageDown works");
+  ok(pageHeight <= 100, "cmd_scrollPageDown doesn't scroll too much");
+  SpecialPowers.doCommand(window, "cmd_scrollBottom");
+  yield;
+  SpecialPowers.doCommand(window, "cmd_scrollPageUp");
+  yield;
+  testScrollCommand("cmd_scrollPageUp", root.scrollHeight - 100 - pageHeight);
+
+  SpecialPowers.doCommand(window, "cmd_scrollTop");
+  yield;
+  SpecialPowers.doCommand(window, "cmd_scrollLineDown");
+  yield;
+  var lineHeight = -root.getBoundingClientRect().top;
+  ok(lineHeight > 0, "Can scroll by lines");
+  SpecialPowers.doCommand(window, "cmd_scrollBottom");
+  yield;
+  SpecialPowers.doCommand(window, "cmd_scrollLineUp");
+  yield;
+  testScrollCommand("cmd_scrollLineUp", root.scrollHeight - 100 - lineHeight);
+
+  var runSelectionTests = function() {
+    testMoveCommand("cmd_moveBottom", body, 23);
+    testMoveCommand("cmd_moveTop", node(0), 0);
+    testSelectCommand("cmd_selectBottom", body, 23);
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    testSelectCommand("cmd_selectTop", node(0), 0);
+
+    SpecialPowers.doCommand(window, "cmd_moveTop");
+    testMoveCommand("cmd_lineNext", node(2), 0);
+    testMoveCommand("cmd_linePrevious", node(0), 0);
+    testSelectCommand("cmd_selectLineNext", node(2), 0);
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    testSelectCommand("cmd_selectLinePrevious", node(20), 2);
+
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    testMoveCommand("cmd_charPrevious", node(22), 1);
+    testMoveCommand("cmd_charNext", node(22), 2);
+    testSelectCommand("cmd_selectCharPrevious", node(22), 1);
+    SpecialPowers.doCommand(window, "cmd_moveTop");
+    testSelectCommand("cmd_selectCharNext", node(0), 1);
+
+    SpecialPowers.doCommand(window, "cmd_moveTop");
+    testMoveCommand("cmd_endLine", node(0), 1);
+    testMoveCommand("cmd_beginLine", node(0), 0);
+    testSelectCommand("cmd_selectEndLine", node(0), 1);
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    testSelectCommand("cmd_selectBeginLine", node(22), 0);
+
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    testMoveCommand("cmd_wordPrevious", node(22), 0);
+    testMoveCommand("cmd_wordNext", body, 23);
+    testSelectCommand("cmd_selectWordPrevious", node(22), 0);
+    SpecialPowers.doCommand(window, "cmd_moveTop");
+    testSelectCommand("cmd_selectWordNext", body, 1);
+
+    SpecialPowers.doCommand(window, "cmd_moveTop");
+    var lineNum = testPageMoveCommand("cmd_movePageDown", 0);
+    ok(lineNum > 0, "cmd_movePageDown works");
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    SpecialPowers.doCommand(window, "cmd_beginLine");
+    is(testPageMoveCommand("cmd_movePageUp", 0), 22 - lineNum, "cmd_movePageUp");
+
+    SpecialPowers.doCommand(window, "cmd_moveTop");
+    is(testPageSelectCommand("cmd_selectPageDown", 0), lineNum, "cmd_selectPageDown");
+    SpecialPowers.doCommand(window, "cmd_moveBottom");
+    SpecialPowers.doCommand(window, "cmd_beginLine");
+    is(testPageSelectCommand("cmd_selectPageUp", 0), 22 - lineNum, "cmd_selectPageUp");
+  };
+
+  await SpecialPowers.pushPrefEnv({set: [["layout.word_select.eat_space_to_next_word", false]]});
+  runSelectionTests();
+  await SpecialPowers.pushPrefEnv({set: [["layout.word_select.eat_space_to_next_word", true]]});
+  runSelectionTests();
+}
+
+function cleanup() {
+  SimpleTest.finish();
+}
+
+async function testRunner() {
+  var e = document.getElementById("edit");
+  var doc = e.contentDocument;
+  var win = e.contentWindow;
+  var body = doc.body;
+
+  body.style.fontSize = "16px";
+  body.style.lineHeight = "16px";
+  body.style.height = "400px";
+  body.style.padding = "0px";
+  body.style.margin = "0px";
+  body.style.borderWidth = "0px";
+
+  doc.designMode = "on";
+  body.innerHTML = "1<br>2<br>3<br>4<br>5<br>6<br>7<br>8<br>9<br>10<br>11<br>12<br>";
+  win.focus();
+  // Flush out layout to make sure that the subdocument will be the size we
+  // expect by the time we try to scroll it.
+  is(body.getBoundingClientRect().height, 400,
+     "Body height should be what we set it to");
+
+  await waitToClearOutAnyPotentialScrolls(win);
+
+  let curTest = runTests();
+  while (true) {
+    let promise = new Promise(resolve => { win.addEventListener("scroll", () => { SimpleTest.executeSoon(resolve); }, {once: true, capture: true}); });
+    if ((await curTest.next()).done) {
+      break;
+    }
+    // wait for the scroll
+    await promise;
+    // clear out any other pending scrolls
+    await waitToClearOutAnyPotentialScrolls(win);
+  }
+}
+
+SimpleTest.waitForFocus(function() {
+  setup()
+    .then(() => testRunner())
+    .then(() => cleanup())
+    .catch(err => ok(false, err));
+}, window);
+
+</script>