diff --git a/src/options/chrome_style/chrome_style.css b/src/options/chrome_style/chrome_style.css
new file mode 100644
index 0000000..367b9ee
--- /dev/null
+++ b/src/options/chrome_style/chrome_style.css
@@ -0,0 +1,346 @@
+/*
+ * Copyright 2014 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * This stylesheet is used to apply Chrome styles to extension pages that opt in
+ * to using them.
+ *
+ * These styles have been copied from ui/webui/resources/css/chrome_shared.css
+ * and ui/webui/resources/css/widgets.css *with CSS class logic removed*, so
+ * that it's as close to a user-agent stylesheet as possible.
+ *
+ * For example, extensions shouldn't be able to set a .link-button class and
+ * have it do anything.
+ *
+ * Other than that, keep this file and chrome_shared.css/widgets.cc in sync as
+ * much as possible.
+ */
+
+body {
+  color: #333;
+  cursor: default;
+  /* Note that the correct font-family and font-size are set in
+   * extension_fonts.css. */
+  /* This top margin of 14px matches the top padding on the h1 element on
+   * overlays (see the ".overlay .page h1" selector in overlay.css), which
+   * every dialogue has.
+   *
+   * Similarly, the bottom 14px margin matches the bottom padding of the area
+   * which hosts the buttons (see the ".overlay .page * .action-area" selector
+   * in overlay.css).
+   *
+   * Both have a padding left/right of 17px.
+   *
+   * Note that we're putting this here in the Extension content, rather than
+   * the WebUI element which contains the content, so that scrollbars in the
+   * Extension content don't get a 6px margin, which looks quite odd.
+   */
+  margin: 14px 17px;
+}
+
+p {
+  line-height: 1.8em;
+}
+
+h1,
+h2,
+h3 {
+  -webkit-user-select: none;
+  font-weight: normal;
+  /* Makes the vertical size of the text the same for all fonts. */
+  line-height: 1;
+}
+
+h1 {
+  font-size: 1.5em;
+}
+
+h2 {
+  font-size: 1.3em;
+  margin-bottom: 0.4em;
+}
+
+h3 {
+  color: black;
+  font-size: 1.2em;
+  margin-bottom: 0.8em;
+}
+
+a {
+  color: rgb(17, 85, 204);
+  text-decoration: underline;
+}
+
+a:active {
+  color: rgb(5, 37, 119);
+}
+
+/* Default state **************************************************************/
+
+:-webkit-any(button,
+             input[type='button'],
+             input[type='submit']),
+select,
+input[type='checkbox'],
+input[type='radio'] {
+  -webkit-appearance: none;
+  -webkit-user-select: none;
+  background-image: linear-gradient(#ededed, #ededed 38%, #dedede);
+  border: 1px solid rgba(0, 0, 0, 0.25);
+  border-radius: 2px;
+  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08),
+      inset 0 1px 2px rgba(255, 255, 255, 0.75);
+  color: #444;
+  font: inherit;
+  margin: 0 1px 0 0;
+  outline: none;
+  text-shadow: 0 1px 0 rgb(240, 240, 240);
+}
+
+:-webkit-any(button,
+             input[type='button'],
+             input[type='submit']),
+select {
+  min-height: 2em;
+  min-width: 4em;
+<if expr="is_win">
+  /* The following platform-specific rule is necessary to get adjacent
+   * buttons, text inputs, and so forth to align on their borders while also
+   * aligning on the text's baselines. */
+  padding-bottom: 1px;
+</if>
+}
+
+:-webkit-any(button,
+             input[type='button'],
+             input[type='submit']) {
+  -webkit-padding-end: 10px;
+  -webkit-padding-start: 10px;
+}
+
+select {
+  -webkit-appearance: none;
+  -webkit-padding-end: 20px;
+  -webkit-padding-start: 6px;
+  /* OVERRIDE */
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAAUUlEQVR4AWP4TxREZkYxpKHAKKzKEhOZvyG4zN8SE7Eq+6+wYCHbTwiT7eeChf8VsFsKVQhTxIDDbVCFfF8ginApgyp82wRShEcZVJIVzoJDAGqrgIJGRl20AAAAAElFTkSuQmCC),
+      linear-gradient(#ededed, #ededed 38%, #dedede);
+  background-position: right center;
+  background-repeat: no-repeat;
+}
+
+html[dir='rtl'] select {
+  background-position: center left;
+}
+
+input[type='checkbox'] {
+  height: 13px;
+  position: relative;
+  vertical-align: middle;
+  width: 13px;
+}
+
+input[type='radio'] {
+  /* OVERRIDE */
+  border-radius: 100%;
+  height: 15px;
+  position: relative;
+  vertical-align: middle;
+  width: 15px;
+}
+
+/* TODO(estade): add more types here? */
+input[type='number'],
+input[type='password'],
+input[type='search'],
+input[type='text'],
+input[type='url'],
+input:not([type]),
+textarea {
+  border: 1px solid #bfbfbf;
+  border-radius: 2px;
+  box-sizing: border-box;
+  color: #444;
+  font: inherit;
+  margin: 0;
+  /* Use min-height to accommodate addditional padding for touch as needed. */
+  min-height: 2em;
+  padding: 3px;
+  outline: none;
+<if expr="is_win or is_macosx or is_ios">
+  /* For better alignment between adjacent buttons and inputs. */
+  padding-bottom: 4px;
+</if>
+}
+
+input[type='search'] {
+  -webkit-appearance: textfield;
+  /* NOTE: Keep a relatively high min-width for this so we don't obscure the end
+   * of the default text in relatively spacious languages (i.e. German). */
+  min-width: 160px;
+}
+
+/* Checked ********************************************************************/
+
+input[type='checkbox']:checked::before {
+  -webkit-user-select: none;
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAsAAAALCAQAAAADpb+tAAAAZ0lEQVR4AWNAA2xAiAXEM8xiMEAXVGJYz7AZCFEkmBi6wYKtEC4/gxqY9gILrmYQhwiXMWxkiAVyVoOFfSCCpkAmCK4Fk+1QA4GqekECUAMkka0KY9gIFvZDd5oawwyGBqACdIDqOwAQzBnTWnnU+gAAAABJRU5ErkJggg==);
+  background-size: 100% 100%;
+  content: '';
+  display: block;
+  height: 100%;
+  width: 100%;
+}
+
+input[type='radio']:checked::before {
+  background-color: #666;
+  border-radius: 100%;
+  bottom: 3px;
+  content: '';
+  display: block;
+  left: 3px;
+  position: absolute;
+  right: 3px;
+  top: 3px;
+}
+
+/* Hover **********************************************************************/
+
+:enabled:hover:-webkit-any(
+    select,
+    input[type='checkbox'],
+    input[type='radio'],
+    :-webkit-any(
+        button,
+        input[type='button'],
+        input[type='submit'])) {
+  background-image: linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
+  border-color: rgba(0, 0, 0, 0.3);
+  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12),
+      inset 0 1px 2px rgba(255, 255, 255, 0.95);
+  color: black;
+}
+
+:enabled:hover:-webkit-any(select) {
+  /* OVERRIDE */
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAAUUlEQVR4AWP4TxREZkYxpKHAKKzKEhOZvyG4zN8SE7Eq+6+wYCHbTwiT7eeChf8VsFsKVQhTxIDDbVCFfF8ginApgyp82wRShEcZVJIVzoJDAGqrgIJGRl20AAAAAElFTkSuQmCC),
+      linear-gradient(#f0f0f0, #f0f0f0 38%, #e0e0e0);
+}
+
+/* Active *********************************************************************/
+
+:enabled:active:-webkit-any(
+    select,
+    input[type='checkbox'],
+    input[type='radio'],
+    :-webkit-any(
+        button,
+        input[type='button'],
+        input[type='submit'])) {
+  background-image: linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
+  box-shadow: none;
+  text-shadow: none;
+}
+
+:enabled:active:-webkit-any(select) {
+  /* OVERRIDE */
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAAUUlEQVR4AWP4TxREZkYxpKHAKKzKEhOZvyG4zN8SE7Eq+6+wYCHbTwiT7eeChf8VsFsKVQhTxIDDbVCFfF8ginApgyp82wRShEcZVJIVzoJDAGqrgIJGRl20AAAAAElFTkSuQmCC),
+      linear-gradient(#e7e7e7, #e7e7e7 38%, #d7d7d7);
+}
+
+/* Disabled *******************************************************************/
+
+:disabled:-webkit-any(
+    button,
+    input[type='button'],
+    input[type='submit']),
+select:disabled {
+  background-image: linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
+  border-color: rgba(80, 80, 80, 0.2);
+  box-shadow: 0 1px 0 rgba(80, 80, 80, 0.08),
+      inset 0 1px 2px rgba(255, 255, 255, 0.75);
+  color: #aaa;
+}
+
+select:disabled {
+  /* OVERRIDE */
+  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABMAAAAICAQAAACxSAwfAAAASUlEQVR4AWP4TxREZkYxpKHAKKzKEhMb/iPDxESsyv4rLFiIULRg4X8F7JaCFSIUMeBwG1QhTBEuZVCFb5tAivAog0qywllwCAAavoiLhz+UlAAAAABJRU5ErkJggg==),
+      linear-gradient(#f1f1f1, #f1f1f1 38%, #e6e6e6);
+}
+
+input:disabled:-webkit-any([type='checkbox'],
+                           [type='radio']) {
+  opacity: .75;
+}
+
+input:disabled:-webkit-any([type='password'],
+                           [type='search'],
+                           [type='text'],
+                           [type='url'],
+                           :not([type])) {
+  color: #999;
+}
+
+/* Focus **********************************************************************/
+
+:enabled:focus:-webkit-any(
+    select,
+    input[type='checkbox'],
+    input[type='number'],
+    input[type='password'],
+    input[type='radio'],
+    input[type='search'],
+    input[type='text'],
+    input[type='url'],
+    input:not([type]),
+    :-webkit-any(
+         button,
+         input[type='button'],
+         input[type='submit'])) {
+  /* OVERRIDE */
+  -webkit-transition: border-color 200ms;
+  /* We use border color because it follows the border radius (unlike outline).
+   * This is particularly noticeable on mac. */
+  border-color: rgb(77, 144, 254);
+  outline: none;
+}
+
+/* Checkbox/radio helpers ******************************************************
+ *
+ * .checkbox and .radio classes wrap labels. Checkboxes and radios should use
+ * these classes with the markup structure:
+ *
+ *   <div class="checkbox">
+ *     <label>
+ *       <input type="checkbox">
+ *       <span>
+ *     </label>
+ *   </div>
+ */
+
+:-webkit-any(.checkbox, .radio) label {
+  /* Don't expand horizontally: <http://crbug.com/112091>. */
+  align-items: center;
+  display: inline-flex;
+  padding-bottom: 7px;
+  padding-top: 7px;
+}
+
+:-webkit-any(.checkbox, .radio) label input {
+  flex-shrink: 0;
+}
+
+:-webkit-any(.checkbox, .radio) label input ~ span {
+  -webkit-margin-start: 0.6em;
+  /* Make sure long spans wrap at the same horizontal position they start. */
+  display: block;
+}
+
+:-webkit-any(.checkbox, .radio) label:hover {
+  color: black;
+}
+
+label > input:disabled:-webkit-any([type='checkbox'], [type='radio']) ~ span {
+  color: #999;
+}
diff --git a/src/options/options.css b/src/options/options.css
new file mode 100644
index 0000000..06b8c40
--- /dev/null
+++ b/src/options/options.css
@@ -0,0 +1,42 @@
+body {
+  padding-top: 16px;
+}
+
+.features-link {
+  position: absolute;
+  top: 8px;
+  right: 8px;
+  width: 24px;
+}
+
+.option {
+  margin: 4px 0;
+  line-height: 1.8em;
+}
+
+.help {
+  cursor: help;
+  border-bottom: dashed 1px gray;
+}
+
+.experimental-label {
+  color: gray;
+}
+
+.actions {
+  text-align: center;
+}
+
+#profileindicatoralt_months {
+  width: 3em;
+}
+
+#save-indicator {
+  text-align: center;
+  margin-bottom: 16px;
+  color: green;
+}
+
+[hidden] {
+  display: none;
+}
diff --git a/src/options/options.html b/src/options/options.html
new file mode 100644
index 0000000..dec47e2
--- /dev/null
+++ b/src/options/options.html
@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Options</title>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" href="options.css">
+    <link rel="stylesheet" href="chrome_style/chrome_style.css">
+  </head>
+  <body>
+    <a href="https://gerrit.avm99963.com/plugins/gitiles/infinitegforums/+/master/docs/features.md" target="_blank" class="features-link">
+      <!--
+        Material Design Icon - action/help_outline
+         - LICENSE: Apache License Version 2.0
+         - Source: https://github.com/google/material-design-icons/
+         - Author: Google LLC
+      -->
+      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M0 0h24v24H0V0z" fill="none"/><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm0 18c-4.41 0-8-3.59-8-8s3.59-8 8-8 8 3.59 8 8-3.59 8-8 8zm-1-4h2v2h-2zm1.61-9.96c-2.06-.3-3.88.97-4.43 2.79-.18.58.26 1.17.87 1.17h.2c.41 0 .74-.29.88-.67.32-.89 1.27-1.5 2.3-1.28.95.2 1.65 1.13 1.57 2.1-.1 1.34-1.62 1.63-2.45 2.88 0 .01-.01.01-.01.02-.01.02-.02.03-.03.05-.09.15-.18.32-.25.5-.01.03-.03.05-.04.08-.01.02-.01.04-.02.07-.12.34-.2.75-.2 1.25h2c0-.42.11-.77.28-1.07.02-.03.03-.06.05-.09.08-.14.18-.27.28-.39.01-.01.02-.03.03-.04.1-.12.21-.23.33-.34.96-.91 2.26-1.65 1.99-3.56-.24-1.74-1.61-3.21-3.35-3.47z"/></svg>
+    </a>
+    <form>
+      <div class="option"><input type="checkbox" id="list"> <label for="list" data-i18n="list"></label></div>
+      <div class="option"><input type="checkbox" id="thread"> <label for="thread" data-i18n="thread"></label></div>
+      <div class="option"><input type="checkbox" id="threadall"> <label for="threadall" data-i18n="threadall"></label></div>
+      <h4 data-i18n="enhancements"></h4>
+      <div class="option"><input type="checkbox" id="fixedtoolbar"> <label for="fixedtoolbar" data-i18n="fixedtoolbar"></label></div>
+      <div class="option"><input type="checkbox" id="redirect"> <label for="redirect" data-i18n="redirect"></label> <span class="experimental-label" data-i18n="experimental_label"></span></div>
+      <div class="option"><input type="checkbox" id="history"> <label for="history" data-i18n="history"></label></div>
+      <div class="option"><input type="checkbox" id="loaddrafts"> <label for="loaddrafts" data-i18n="loaddrafts"></label> <span class="experimental-label" data-i18n="experimental_label"></span></div>
+      <div class="option"><input type="checkbox" id="increasecontrast"> <label for="increasecontrast" data-i18n="increasecontrast"></label></div>
+      <div class="option"><input type="checkbox" id="stickysidebarheaders"> <label for="stickysidebarheaders" data-i18n="stickysidebarheaders"></label></div>
+      <div class="option"><input type="checkbox" id="ccdarktheme"> <label for="ccdarktheme" data-i18n="ccdarktheme"></label> <span class="experimental-label" data-i18n="experimental_label"></span></div>
+      <div class="option"><input type="checkbox" id="ccforcehidedrawer"> <label for="ccforcehidedrawer" data-i18n="ccforcehidedrawer"></label></div>
+      <div id="dragndrop-wrapper" class="option" hidden><input type="checkbox" id="ccdragndropfix"> <label for="ccdragndropfix" data-i18n="ccdragndropfix"></label></div>
+      <div class="option"><input type="checkbox" id="batchlock"> <label for="batchlock" data-i18n="batchlock"></label> <span class="experimental-label" data-i18n="experimental_label"></span></div>
+      <h4 data-i18n="profileindicator_header"></h4>
+      <div class="option"><input type="checkbox" id="profileindicator"> <label for="profileindicator" data-i18n="profileindicator"></label> <span class="experimental-label" data-i18n="experimental_label"></span></div>
+      <div class="option"><input type="checkbox" id="profileindicatoralt"> <label for="profileindicatoralt" data-i18n="profileindicatoralt"></label> <span class="experimental-label" data-i18n="experimental_label"></span></div>
+      <div class="option"><a href="https://gerrit.avm99963.com/plugins/gitiles/infinitegforums/+/refs/heads/master/docs/op_indicator.md" target="_blank" rel="noreferrer noopener" data-i18n="profileindicator_moreinfo"></a></div>
+      <div class="actions"><button id="save" data-i18n="save"></button></div>
+    </form>
+    <div id="save-indicator"></div>
+    <script src="common/common.js"></script>
+    <script src="options.js"></script>
+  </body>
+</html>
diff --git a/src/options/options.js b/src/options/options.js
new file mode 100644
index 0000000..46913d4
--- /dev/null
+++ b/src/options/options.js
@@ -0,0 +1,153 @@
+var savedSuccessfullyTimeout = null;
+
+const exclusiveOptions = [['thread', 'threadall']];
+
+function save(e) {
+  var options = defaultOptions;
+
+  // Validation checks before saving
+  var months = document.getElementById('profileindicatoralt_months');
+  if (!months.checkValidity()) {
+    console.warn(months.validationMessage);
+    return;
+  }
+
+  e.preventDefault();
+
+  // Save
+  Object.keys(options).forEach(function(opt) {
+    if (deprecatedOptions.includes(opt)) return;
+
+    if (specialOptions.includes(opt)) {
+      switch (opt) {
+        case 'profileindicatoralt_months':
+          options[opt] = document.getElementById(opt).value || 12;
+          break;
+
+        case 'ccdarktheme_mode':
+          options[opt] = document.getElementById(opt).value || 'switch';
+          break;
+
+        // This option is controlled directly in the Community Console.
+        case 'ccdarktheme_switch_enabled':
+          break;
+
+        case 'ccdragndropfix':
+          options[opt] = document.getElementById(opt).checked || false;
+          break;
+
+        default:
+          console.warn('Unrecognized option: ' + opt);
+          break;
+      }
+      return;
+    }
+
+    options[opt] = document.getElementById(opt).checked || false;
+  });
+
+  chrome.storage.sync.set(options, function() {
+    window.close();
+
+    // In browsers like Firefox window.close is not supported:
+    if (savedSuccessfullyTimeout !== null)
+      window.clearTimeout(savedSuccessfullyTimeout);
+
+    document.getElementById('save-indicator').innerText =
+        '✓ ' + chrome.i18n.getMessage('options_saved');
+    savedSuccessfullyTimeout = window.setTimeout(_ => {
+      document.getElementById('save-indicator').innerText = '';
+    }, 3699);
+  });
+}
+
+function i18n() {
+  document.querySelectorAll('[data-i18n]')
+      .forEach(
+          el => el.innerHTML = chrome.i18n.getMessage(
+              'options_' + el.getAttribute('data-i18n')));
+}
+
+window.addEventListener('load', function() {
+  i18n();
+
+  chrome.storage.sync.get(null, function(items) {
+    items = cleanUpOptions(items);
+
+    Object.keys(defaultOptions).forEach(function(opt) {
+      if (deprecatedOptions.includes(opt)) return;
+
+      if (specialOptions.includes(opt)) {
+        switch (opt) {
+          case 'profileindicatoralt_months':
+            var input = document.createElement('input');
+            input.type = 'number';
+            input.id = 'profileindicatoralt_months';
+            input.max = '12';
+            input.min = '1';
+            input.value = items[opt];
+            input.required = true;
+            document.getElementById('profileindicatoralt_months--container')
+                .appendChild(input);
+            break;
+
+          case 'ccdarktheme_mode':
+            var select = document.createElement('select');
+            select.id = 'ccdarktheme_mode';
+
+            const modes = ['switch', 'system'];
+            for (const mode of modes) {
+              var modeOption = document.createElement('option');
+              modeOption.value = mode;
+              modeOption.textContent =
+                  chrome.i18n.getMessage('options_ccdarktheme_mode_' + mode);
+              if (items.ccdarktheme_mode == mode) modeOption.selected = true;
+              select.appendChild(modeOption);
+            }
+
+            document.getElementById('ccdarktheme_mode--container')
+                .appendChild(select);
+            break;
+
+          // This option is controlled directly in the Community Console.
+          case 'ccdarktheme_switch_enabled':
+            break;
+
+          // Firefox doesn't support drag and dropping bookmarks into the text
+          // editor while preserving the bookmark title.
+          case 'ccdragndropfix':
+            var showOption = !isFirefox();
+            if (showOption) {
+              document.getElementById('dragndrop-wrapper')
+                  .removeAttribute('hidden');
+
+              if (items[opt] === true)
+                document.getElementById(opt).checked = true;
+            }
+            break;
+
+          default:
+            console.warn('Unrecognized option: ' + opt);
+            break;
+        }
+        return;
+      }
+
+      if (items[opt] === true) document.getElementById(opt).checked = true;
+    });
+
+    exclusiveOptions.forEach(exclusive => {
+      exclusive.forEach(
+          el => document.getElementById(el).addEventListener('change', e => {
+            if (document.getElementById(exclusive[0]).checked &&
+                document.getElementById(exclusive[1]).checked) {
+              document
+                  .getElementById(
+                      exclusive[(e.currentTarget.id == exclusive[0] ? 1 : 0)])
+                  .checked = false;
+            }
+          }));
+    });
+    document.querySelector('#save').addEventListener('click', save);
+  });
+});