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diff --git a/app/javascript/glitch/reducers/local_settings.js b/app/javascript/glitch/reducers/local_settings.js
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+/*
+
+`reducers/local_settings`
+========================
+
+>   For more information on the contents of this file, please contact:
+>
+>   - kibigo! [@kibi@glitch.social]
+
+This file provides our Redux reducers related to local settings. The
+associated actions are:
+
+ -  __`STORE_HYDRATE` :__
+    Used to hydrate the store with its initial values.
+
+ -  __`LOCAL_SETTING_CHANGE` :__
+    Used to change the value of a local setting in the store.
+
+*/
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+/*
+
+Imports:
+--------
+
+*/
+
+//  Package imports  //
+import { Map as ImmutableMap } from 'immutable';
+
+//  Mastodon imports  //
+import { STORE_HYDRATE } from '../../mastodon/actions/store';
+
+//  Our imports  //
+import { LOCAL_SETTING_CHANGE } from '../actions/local_settings';
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+/*
+
+initialState:
+-------------
+
+You can see the default values for all of our local settings here.
+These are only used if no previously-saved values exist.
+
+*/
+
+const initialState = ImmutableMap({
+  layout    : 'auto',
+  stretch   : true,
+  navbar_under : false,
+  collapsed : ImmutableMap({
+    enabled     : true,
+    auto        : ImmutableMap({
+      all              : false,
+      notifications    : true,
+      lengthy          : true,
+      replies          : false,
+      media            : false,
+    }),
+    backgrounds : ImmutableMap({
+      user_backgrounds : false,
+      preview_images   : false,
+    }),
+  }),
+  media     : ImmutableMap({
+    letterbox   : true,
+    fullwidth   : true,
+  }),
+});
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+/*
+
+Helper functions:
+-----------------
+
+###  `hydrate(state, localSettings)`
+
+`hydrate()` is used to hydrate the `local_settings` part of our store
+with its initial values. The `state` will probably just be the
+`initialState`, and the `localSettings` should be whatever we pulled
+from `localStorage`.
+
+*/
+
+const hydrate = (state, localSettings) => state.mergeDeep(localSettings);
+
+//  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+
+/*
+
+`localSettings(state = initialState, action)`:
+----------------------------------------------
+
+This function holds our actual reducer.
+
+If our action is `STORE_HYDRATE`, then we call `hydrate()` with the
+`local_settings` property of the provided `action.state`.
+
+If our action is `LOCAL_SETTING_CHANGE`, then we set `action.key` in
+our state to the provided `action.value`. Note that `action.key` MUST
+be an array, since we use `setIn()`.
+
+>   __Note :__
+>   We call this function `localSettings`, but its associated object
+>   in the store is `local_settings`.
+
+*/
+
+export default function localSettings(state = initialState, action) {
+  switch(action.type) {
+  case STORE_HYDRATE:
+    return hydrate(state, action.state.get('local_settings'));
+  case LOCAL_SETTING_CHANGE:
+    return state.setIn(action.key, action.value);
+  default:
+    return state;
+  }
+};