diff --git a/source/options/components/exports.ts b/source/options/components/exports.ts
index de6af4d..f065e5a 100644
--- a/source/options/components/exports.ts
+++ b/source/options/components/exports.ts
@@ -8,5 +8,6 @@ export {JumpToNewCommentSetting} from "./jump-to-new-comment.js";
 export {MarkdownToolbarSetting} from "./markdown-toolbar.js";
 export {MiscellaneousSetting} from "./miscellaneous.js";
 export {ThemedLogoSetting} from "./themed-logo.js";
+export {ThemeSwitcherSetting} from "./theme-switcher.js";
 export {UserLabelsSetting} from "./user-labels.js";
 export {UsernameColorsSetting} from "./username-colors.js";
diff --git a/source/options/components/theme-switcher.tsx b/source/options/components/theme-switcher.tsx
new file mode 100644
index 0000000..68e02d1
--- /dev/null
+++ b/source/options/components/theme-switcher.tsx
@@ -0,0 +1,129 @@
+import {Component} from "preact";
+import {type Value} from "@holllo/webextension-storage";
+import {
+  Data,
+  Feature,
+  fromStorage,
+  type ThemeSwitcherData,
+} from "../../storage/exports.js";
+import {Setting, type SettingProps} from "./index.js";
+
+type State = {
+  data: Value<ThemeSwitcherData> | undefined;
+  hasUnsavedChanges: boolean;
+  themesList: Array<[string, string]>;
+};
+
+export class ThemeSwitcherSetting extends Component<SettingProps, State> {
+  constructor(props: SettingProps) {
+    super(props);
+
+    this.state = {
+      data: undefined,
+      hasUnsavedChanges: false,
+      themesList: [],
+    };
+  }
+
+  async componentDidMount() {
+    const themesList = await fromStorage(Data.ThemesList);
+    this.setState({
+      data: await fromStorage(Feature.ThemeSwitcher),
+      themesList: themesList.value,
+    });
+  }
+
+  onChange = (event: Event, key: keyof ThemeSwitcherData) => {
+    const {data} = this.state;
+    const target = event.target as HTMLInputElement | HTMLSelectElement;
+
+    if (data === undefined) {
+      return;
+    }
+
+    data.value[key] = target.value;
+    this.setState({data, hasUnsavedChanges: true});
+  };
+
+  save = async () => {
+    const {data} = this.state;
+    if (data === undefined) {
+      return;
+    }
+
+    await data.save();
+    this.setState({hasUnsavedChanges: false});
+  };
+
+  render() {
+    const {data, hasUnsavedChanges, themesList} = this.state;
+    if (data === undefined) {
+      return;
+    }
+
+    const themeOptions = themesList.map(([value, text]) => (
+      <option value={value}>{text}</option>
+    ));
+
+    const unsavedChanges = hasUnsavedChanges ? "unsaved-changes" : "";
+
+    return (
+      <Setting {...this.props}>
+        <p class="info">
+          Automatically switch between two themes at certain times of the day.
+        </p>
+
+        <button
+          class={`button margin-bottom-8 has-save-status ${unsavedChanges}`}
+          onClick={this.save}
+        >
+          Save{hasUnsavedChanges ? "*" : ""}
+        </button>
+
+        <p>
+          Switch to{" "}
+          <select
+            class="styled-select"
+            onChange={(event) => {
+              this.onChange(event, "themeA");
+            }}
+            value={data.value.themeA}
+          >
+            {themeOptions}
+          </select>{" "}
+          at{" "}
+          <input
+            class="styled-text-input"
+            onChange={(event) => {
+              this.onChange(event, "hourA");
+            }}
+            type="text"
+            value={data.value.hourA}
+          />
+        </p>
+
+        <p>
+          Switch to{" "}
+          <select
+            class="styled-select"
+            onChange={(event) => {
+              this.onChange(event, "themeB");
+            }}
+            value={data.value.themeB}
+          >
+            {themeOptions}
+          </select>{" "}
+          at{" "}
+          <input
+            class="styled-text-input"
+            onChange={(event) => {
+              this.onChange(event, "hourB");
+            }}
+            type="text"
+            value={data.value.hourB}
+          />
+        </p>
+      </Setting>
+    );
+  }
+}
diff --git a/source/options/features.ts b/source/options/features.ts
index 404ba66..d35bbd0 100644
--- a/source/options/features.ts
+++ b/source/options/features.ts
@@ -9,6 +9,7 @@ import {
   JumpToNewCommentSetting,
   MarkdownToolbarSetting,
   MiscellaneousSetting,
+  ThemeSwitcherSetting,
   ThemedLogoSetting,
   UserLabelsSetting,
   UsernameColorsSetting,
@@ -83,6 +84,13 @@ export const features: FeatureData[] = [
     title: "Miscellaneous",
     component: MiscellaneousSetting,
   },
+  {
+    availableSince: new Date("2023-12-24"),
+    index: 0,
+    key: Feature.ThemeSwitcher,
+    title: "Theme Switcher",
+    component: ThemeSwitcherSetting,
+  },
   {
     availableSince: new Date("2022-02-27"),
     index: 0,
diff --git a/source/scss/_button.scss b/source/scss/_button.scss
index a5b94fb..cec0b90 100644
--- a/source/scss/_button.scss
+++ b/source/scss/_button.scss
@@ -1,5 +1,5 @@
 @mixin button {
-  --button-color: var(--blue);
+  --button-color: var(--save-status-color, var(--blue));
   --button-color-alt: var(--dark-blue);
 
   background-color: var(--button-color);
diff --git a/source/scss/_settings.scss b/source/scss/_settings.scss
index 6a63ede..802798d 100644
--- a/source/scss/_settings.scss
+++ b/source/scss/_settings.scss
@@ -157,10 +157,15 @@
     }
   }
 
+  .styled-text-input,
   .styled-select {
     background-color: var(--background-primary);
     border: 1px solid var(--save-status-color, var(--blue));
     color: var(--foreground);
     padding: 8px;
   }
+
+  .margin-bottom-8 {
+    margin-bottom: 8px;
+  }
 }
diff --git a/source/storage/enums.ts b/source/storage/enums.ts
index b3822bd..975f628 100644
--- a/source/storage/enums.ts
+++ b/source/storage/enums.ts
@@ -12,6 +12,7 @@ export enum Feature {
   MarkdownToolbar = "markdown-toolbar",
   Miscellaneous = "miscellaneous-features",
   ThemedLogo = "themed-logo",
+  ThemeSwitcher = "theme-switcher",
   UserLabels = "user-labels",
   UsernameColors = "username-colors",
 }
diff --git a/source/storage/exports.ts b/source/storage/exports.ts
index 3cdd655..2a0c669 100644
--- a/source/storage/exports.ts
+++ b/source/storage/exports.ts
@@ -27,6 +27,23 @@ export type HideVotesData = {
   ownTopics: boolean;
 };
 
+/**
+ * The data stored for the Theme Switcher feature.
+ */
+export type ThemeSwitcherData = {
+  /** The hour to switch to theme A. */
+  hourA: string;
+
+  /** The hour to switch to theme B. */
+  hourB: string;
+
+  /** The value of the theme from the theme selector for the first theme. */
+  themeA: string;
+
+  /** The value of the theme from the theme selector for the second theme. */
+  themeB: string;
+};
+
 /**
  * All storage {@link Value}s stored in WebExtension storage.
  */
@@ -134,6 +151,18 @@ export const storageValues = {
     },
     storage: browser.storage.sync,
   }),
+  [Feature.ThemeSwitcher]: createValue<ThemeSwitcherData>({
+    deserialize: (input) => JSON.parse(input) as ThemeSwitcherData,
+    serialize: (input) => JSON.stringify(input),
+    key: Feature.ThemeSwitcher,
+    value: {
+      hourA: "09:00",
+      hourB: "21:00",
+      themeA: "white",
+      themeB: "black",
+    },
+    storage: browser.storage.sync,
+  }),
   [Feature.UserLabels]: collectUserLabels(),
   [Feature.UsernameColors]: collectUsernameColors(),
 };