diff -r 000000000000 -r 6474c204b198 toolkit/components/viewsource/test/browser/browser_viewsourceprefs_nonhtml.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/viewsource/test/browser/browser_viewsourceprefs_nonhtml.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,135 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+let source = "data:text/plain,hello+world";
+let mWindow, wrapMenuItem, syntaxMenuItem;
+
+// Check the default values are set.
+function test() {
+  waitForExplicitFinish();
+
+  registerCleanupFunction(function() {
+    SpecialPowers.clearUserPref("view_source.tab_size");
+    SpecialPowers.clearUserPref("view_source.wrap_long_lines");
+    SpecialPowers.clearUserPref("view_source.syntax_highlight");
+  });
+
+  openViewSourceWindow(source, function(aWindow) {
+    mWindow = aWindow;
+    wrapMenuItem = aWindow.document.getElementById('menu_wrapLongLines');
+    syntaxMenuItem = aWindow.document.getElementById('menu_highlightSyntax');
+
+    // Strip checked="false" attributes, since we're not interested in them.
+    if (wrapMenuItem.getAttribute("checked") == "false")
+      wrapMenuItem.removeAttribute("checked");
+    if (syntaxMenuItem.getAttribute("checked") == "false")
+      syntaxMenuItem.removeAttribute("checked");
+
+    is(wrapMenuItem.hasAttribute("checked"), false, "Wrap menu item not checked by default");
+    is(syntaxMenuItem.hasAttribute("checked"), true, "Syntax menu item checked by default");
+    checkStyle(aWindow, "-moz-tab-size", 4);
+    checkStyle(aWindow, "white-space", "pre");
+
+    test1();
+  });
+}
+
+// Check that the Wrap Long Lines menu item works.
+function test1() {
+  simulateClick(wrapMenuItem);
+
+  is(wrapMenuItem.hasAttribute("checked"), true, "Wrap menu item checked");
+  is(SpecialPowers.getBoolPref("view_source.wrap_long_lines"), true, "Wrap pref set");
+  checkStyle(mWindow, "white-space", "pre-wrap");
+  test2();
+}
+
+function test2() {
+  simulateClick(wrapMenuItem);
+
+  is(wrapMenuItem.hasAttribute("checked"), false, "Wrap menu item unchecked");
+  is(SpecialPowers.getBoolPref("view_source.wrap_long_lines"), false, "Wrap pref set");
+  checkStyle(mWindow, "white-space", "pre");
+  test3();
+}
+
+// Check that the Syntax Highlighting menu item works.
+function test3() {
+  mWindow.gBrowser.addEventListener("pageshow", function test3Handler() {
+    mWindow.gBrowser.removeEventListener("pageshow", test3Handler, false);
+    is(syntaxMenuItem.hasAttribute("checked"), false, "Syntax menu item unchecked");
+    is(SpecialPowers.getBoolPref("view_source.syntax_highlight"), false, "Syntax highlighting pref set");
+
+    checkHighlight(mWindow, false);
+    test4();
+  }, false);
+
+  simulateClick(syntaxMenuItem);
+}
+
+function test4() {
+  mWindow.gBrowser.addEventListener("pageshow", function test4Handler() {
+    mWindow.gBrowser.removeEventListener("pageshow", test4Handler, false);
+    is(syntaxMenuItem.hasAttribute("checked"), true, "Syntax menu item checked");
+    is(SpecialPowers.getBoolPref("view_source.syntax_highlight"), true, "Syntax highlighting pref set");
+
+    checkHighlight(mWindow, false);
+    closeViewSourceWindow(mWindow, test5);
+  }, false);
+
+  simulateClick(syntaxMenuItem);
+}
+
+// Open a new view-source window to check prefs are obeyed.
+function test5() {
+  SpecialPowers.setIntPref("view_source.tab_size", 2);
+  SpecialPowers.setBoolPref("view_source.wrap_long_lines", true);
+  SpecialPowers.setBoolPref("view_source.syntax_highlight", false);
+
+  executeSoon(function() {
+    openViewSourceWindow(source, function(aWindow) {
+      wrapMenuItem = aWindow.document.getElementById('menu_wrapLongLines');
+      syntaxMenuItem = aWindow.document.getElementById('menu_highlightSyntax');
+
+      // Strip checked="false" attributes, since we're not interested in them.
+      if (wrapMenuItem.getAttribute("checked") == "false")
+        wrapMenuItem.removeAttribute("checked");
+      if (syntaxMenuItem.getAttribute("checked") == "false")
+        syntaxMenuItem.removeAttribute("checked");
+
+      is(wrapMenuItem.hasAttribute("checked"), true, "Wrap menu item checked");
+      is(syntaxMenuItem.hasAttribute("checked"), false, "Syntax menu item unchecked");
+      checkStyle(aWindow, "-moz-tab-size", 2);
+      checkStyle(aWindow, "white-space", "pre-wrap");
+      checkHighlight(aWindow, false);
+      closeViewSourceWindow(aWindow, finish);
+    });
+  });
+}
+
+// Simulate a menu item click, including toggling the checked state.
+// This saves us from opening the menu and trying to click on the item,
+// which doesn't work on Mac OS X.
+function simulateClick(aMenuItem) {
+  if (aMenuItem.hasAttribute("checked"))
+    aMenuItem.removeAttribute("checked");
+  else
+    aMenuItem.setAttribute("checked", "true");
+
+  aMenuItem.click();
+}
+
+function checkStyle(aWindow, aStyleProperty, aExpectedValue) {
+  let gBrowser = aWindow.gBrowser;
+  let computedStyle = gBrowser.contentWindow.getComputedStyle(gBrowser.contentDocument.body, null);
+
+  is(computedStyle.getPropertyValue(aStyleProperty), aExpectedValue, "Correct value of " + aStyleProperty);
+}
+
+function checkHighlight(aWindow, aExpected) {
+  let spans = aWindow.gBrowser.contentDocument.getElementsByTagName("span");
+  is(Array.some(spans, function(aSpan) {
+    return aSpan.className != "";
+  }), aExpected, "Syntax highlighting " + (aExpected ? "on" : "off"));
+}