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+++ b/editor/spellchecker/tests/test_bug1204147.html
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+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1204147
+-->
+<head>
+  <title>Test for Bug 1204147</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1204147">Mozilla Bug 1204147</a>
+<p id="display"></p>
+<iframe id="content"></iframe>
+</div>
+
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 1204147 **/
+SimpleTest.waitForExplicitFinish();
+var content = document.getElementById("content");
+// Load a subframe containing an editor with using "en-GB". At first
+// load, it will set the dictionary to "en-GB". The bug was that a content preference
+// was also created. At second load, we check the dictionary for another element,
+// one that should use "en-US". With the bug corrected, we get "en-US", before
+// we got "en-GB" from the content preference.
+
+var firstLoad = true;
+var script;
+
+var loadListener = async function(evt) {
+  if (firstLoad) {
+    /* eslint-env mozilla/frame-script */
+    script = SpecialPowers.loadChromeScript(function() {
+      // eslint-disable-next-line mozilla/use-services
+      var dir = Cc["@mozilla.org/file/directory_service;1"]
+                  .getService(Ci.nsIProperties)
+                  .get("CurWorkD", Ci.nsIFile);
+      dir.append("tests");
+      dir.append("editor");
+      dir.append("spellchecker");
+      dir.append("tests");
+
+      var hunspell = Cc["@mozilla.org/spellchecker/engine;1"]
+                       .getService(Ci.mozISpellCheckingEngine);
+
+      // Install en-GB dictionary.
+      let en_GB = dir.clone();
+      en_GB.append("en-GB");
+      hunspell.addDirectory(en_GB);
+
+      addMessageListener("en_GB-exists", () => en_GB.exists());
+      addMessageListener("destroy", () => hunspell.removeDirectory(en_GB));
+    });
+    is(await script.sendQuery("en_GB-exists"), true,
+       "true expected (en-GB directory should exist)");
+  }
+
+  var doc = evt.target.contentDocument;
+  var elem;
+  if (firstLoad) {
+    elem = doc.getElementById("en-GB");
+  } else {
+    elem = doc.getElementById("en-US");
+  }
+
+  var editor = SpecialPowers.wrap(elem).editor;
+  editor.setSpellcheckUserOverride(true);
+  var inlineSpellChecker = editor.getInlineSpellChecker(true);
+
+  SpecialPowers.Cu.import(
+    "resource://testing-common/AsyncSpellCheckTestHelper.jsm")
+  .onSpellCheck(elem, function() {
+    var spellchecker = inlineSpellChecker.spellChecker;
+    try {
+      var currentDictonary = spellchecker.GetCurrentDictionary();
+    } catch (e) {}
+
+    if (firstLoad) {
+      firstLoad = false;
+
+       // First time around, the element's language should be used.
+      is(currentDictonary, "en-GB", "unexpected lang " + currentDictonary + " instead of en-GB");
+
+      // Note that on second load, we load a different page, which does NOT have the trouble-causing
+      // contenteditable in it. Sadly, loading the same page with the trouble-maker in it
+      // doesn't allow the retrieval of the spell check dictionary used for the element,
+      // because the trouble-maker causes the 'global' spell check dictionary to be set to "en-GB"
+      // (since it picks the first one from the list) before we have the chance to retrieve
+      // the dictionary for the element (which happens asynchonously after the spell check has completed).
+      content.src = "http://mochi.test:8888/tests/editor/spellchecker/tests/bug1204147_subframe2.html?firstload=false";
+    } else {
+      // Second time around, the element should default to en-US.
+      // Without the fix, the first run sets the content preference to en-GB for the whole site.
+      is(currentDictonary, "en-US", "unexpected lang " + currentDictonary + " instead of en-US");
+      content.removeEventListener("load", loadListener);
+
+      // Remove the fake en-GB dictionary again, since it's otherwise picked up by later tests.
+      script.sendAsyncMessage("destroy");
+
+      // Reset the preference, so the last value we set doesn't collide with the next test.
+      SimpleTest.finish();
+    }
+  });
+};
+
+content.addEventListener("load", loadListener);
+
+content.src = "http://mochi.test:8888/tests/editor/spellchecker/tests/bug1204147_subframe.html?firstload=true";
+
+</script>
+</pre>
+</body>
+</html>