diff --git a/docs/_layouts/palette.njk b/docs/_layouts/palette.njk
index d00d7c475..bc3f851a5 100644
--- a/docs/_layouts/palette.njk
+++ b/docs/_layouts/palette.njk
@@ -30,12 +30,21 @@
 
   {% include 'breadcrumbs.njk' %}
 
-  <h1 v-if="saved" class="title">
-    {% raw %}{{ saved.title }}{% endraw %}
-    <wa-icon-button name="pencil" label="Rename palette" @click="rename"></wa-icon-button>
-    <wa-icon-button class="delete" name="trash" label="Delete palette" @click="deleteSaved"></wa-icon-button>
+  <h1 class="title">
+    <span v-content="paletteTitle">{{ title }}</span>
+    <template v-if="saved || tweaked">
+      <wa-icon-button name="pencil" label="Rename palette" @click="rename"></wa-icon-button>
+      <wa-icon-button v-if="saved" class="delete" name="trash" label="Delete palette" @click="deleteSaved"></wa-icon-button>
+      <wa-button @click="save()" :disabled="!unsavedChanges"
+        :variant="unsavedChanges ? 'success' : 'neutral'" size="small" :appearance="unsavedChanges ? 'accent' : 'outlined'">
+        <span slot="prefix" class="icon-modifier">
+          <wa-icon name="sidebar" variant="regular"></wa-icon>
+          <wa-icon name="circle-plus" class="modifier" style="color: light-dark(var(--wa-color-green-70), var(--wa-color-green-60));"></wa-icon>
+        </span>
+        <span v-content="unsavedChanges ? 'Save' : 'Saved'">Save</span>
+      </wa-button>
+    </template>
   </h1>
-  <h1 v-if="!saved" class="title">{{ title }}</h1>
 
   <div class="block-info">
     <code class="class">.wa-palette-{{ paletteId }}</code>
@@ -68,13 +77,6 @@
     </span>
     Reset
   </wa-button>
-  <wa-button v-if="!saved" @click="save" variant="success">
-    <span slot="prefix" class="icon-modifier">
-      <wa-icon name="sidebar" variant="regular"></wa-icon>
-      <wa-icon name="circle-plus" class="modifier" style="color: light-dark(var(--wa-color-green-70), var(--wa-color-green-60));"></wa-icon>
-    </span>
-    Save
-  </wa-button>
 </wa-callout>
 
 <table class="colors main wa-palette-{{ paletteId }}">
diff --git a/docs/assets/scripts/sidebar-tweaks.js b/docs/assets/scripts/sidebar-tweaks.js
index 1c245717d..48b7076a5 100644
--- a/docs/assets/scripts/sidebar-tweaks.js
+++ b/docs/assets/scripts/sidebar-tweaks.js
@@ -13,23 +13,33 @@ sidebar.palettes = {
     sidebar.updateCurrent();
   },
 
-  updateSaved() {
-    this.saved = localStorage.savedPalettes ? JSON.parse(localStorage.savedPalettes) : [];
+  saved: [],
+
+  /**
+   * Update saved palettes from local storage
+   */
+  fromLocalStorage() {
+    // Replace contents of array without breaking references
+    let saved = localStorage.savedPalettes ? JSON.parse(localStorage.savedPalettes) : [];
+    this.saved.splice(0, this.saved.length, ...saved);
   },
 
-  save(saved = this.saved) {
-    this.saved = saved ?? [];
-
-    if (saved.length > 0) {
-      localStorage.savedPalettes = JSON.stringify(saved);
+  /**
+   * Write palettes to local storage
+   */
+  toLocalStorage() {
+    if (this.saved.length > 0) {
+      localStorage.savedPalettes = JSON.stringify(this.saved);
     } else {
       delete localStorage.savedPalettes;
     }
   },
 };
 
-sidebar.palettes.updateSaved();
-addEventListener('storage', event => sidebar.palettes.updateSaved());
+sidebar.palettes.fromLocalStorage();
+
+// Palettes were updated in another tab
+addEventListener('storage', () => sidebar.palettes.fromLocalStorage());
 
 sidebar.palette = {
   getUid() {
@@ -59,7 +69,9 @@ sidebar.palette = {
   delete(palette) {
     let savedPalettes = sidebar.palettes.saved;
     let count = savedPalettes.length;
-    if (count === 0) {
+
+    if (count === 0 || !palette.uid) {
+      // No stored palettes or this palette has not been saved
       return;
     }
 
@@ -68,7 +80,9 @@ sidebar.palette = {
       return;
     }
 
-    savedPalettes = savedPalettes.filter(p => !sidebar.palette.equals(palette, p));
+    for (let index; (index = savedPalettes.findIndex(p => p.uid === palette.uid)) > -1; ) {
+      savedPalettes.splice(index, 1);
+    }
 
     if (savedPalettes.length === count) {
       // Nothing was removed
@@ -96,17 +110,14 @@ sidebar.palette = {
 
     sidebar.updateCurrent();
 
-    sidebar.palettes.save(savedPalettes);
+    sidebar.palettes.toLocalStorage();
 
-    if (sidebar.palette.equals(globalThis.paletteApp?.saved, palette)) {
+    if (globalThis.paletteApp?.saved?.uid === palette.uid) {
+      // We deleted the currently active palette
       paletteApp.postDelete();
     }
   },
 
-  getSaved(palette, savedPalettes = sidebar.palettes.saved) {
-    return savedPalettes.find(p => sidebar.palette.equals(p, palette));
-  },
-
   render(palette) {
     // Find existing <a>
     let { title, id, search, uid } = palette;
@@ -146,23 +157,27 @@ sidebar.palette = {
     }
   },
 
-  save(palette, saved) {
-    let savedPalettes = sidebar.palettes.saved;
-    let existing = this.getSaved(saved ?? palette, savedPalettes);
-    let oldValues;
-
-    if (existing) {
-      // Rename
-      oldValues = { ...existing };
-      Object.assign(existing, palette);
-    } else {
-      savedPalettes.push(palette);
+  /**
+   * Save a palette, either by updating its existing entry or creating a new one
+   * @param {object} palette
+   */
+  save(palette) {
+    if (!palette.uid) {
+      // First time saving
+      palette.uid = this.getUid();
     }
 
+    let savedPalettes = sidebar.palettes.saved;
+    let existingIndex = palette.uid ? sidebar.palettes.saved.findIndex(p => p.uid === palette.uid) : -1;
+    let newIndex = existingIndex > -1 ? existingIndex : savedPalettes.length;
+
+    let [oldValues] = sidebar.palettes.saved.splice(newIndex, 1, palette);
+
     this.render(palette, oldValues);
     sidebar.updateCurrent();
+    sidebar.palettes.toLocalStorage();
 
-    sidebar.palettes.save(savedPalettes);
+    return palette;
   },
 };
 
diff --git a/docs/assets/scripts/tweak/permalink.js b/docs/assets/scripts/tweak/permalink.js
index 27031dfd4..3d98b709e 100644
--- a/docs/assets/scripts/tweak/permalink.js
+++ b/docs/assets/scripts/tweak/permalink.js
@@ -13,56 +13,42 @@ export default class Permalink extends URLSearchParams {
     return Object.fromEntries(this.entries());
   }
 
-  #mappings = new WeakMap();
-
-  mapObject(obj, mapping = {}) {
-    this.#mappings.set(obj, mapping);
-  }
-
-  readFrom(obj) {
-    let mapping = this.#mappings.get(obj) ?? {};
-    let { keyFrom = IDENTITY, valueFrom = IDENTITY } = mapping;
-
-    for (let key in obj) {
-      let value = obj[key];
-      let mappedValue = valueFrom(value);
-      let mappedKey = keyFrom(key);
-      this.set(mappedKey, mappedValue);
-    }
-  }
-
-  writeTo(obj) {
-    let mapping = this.#mappings.get(obj) ?? {};
-    let { keyTo = IDENTITY, valueTo = IDENTITY, canExtend = false } = mapping;
-
-    for (let [key, value] of this) {
-      let mappedKey = keyTo(key);
-      let mappedValue = valueTo(value);
-
-      if (canExtend || mappedKey in obj) {
-        obj[mappedKey] = mappedValue;
-      }
-    }
-  }
-
   set(key, value, defaultValue) {
-    let oldValue = this.get(key);
+    if (equals(value, defaultValue) || equals(value, '')) {
+      value = null;
+    }
 
-    if (!value || value == defaultValue) {
+    value ??= null; // undefined -> null
+
+    let oldValue = Array.isArray(value) ? this.getAll(key) : this.get(key);
+    let changed = !equals(value, oldValue);
+
+    if (!changed) {
+      // Nothing to do here
+      return;
+    }
+
+    if (Array.isArray(value)) {
       super.delete(key);
+      value = value.slice();
 
-      if (oldValue) {
-        this.changed = true;
+      for (let v of value) {
+        if (v || v === 0) {
+          if (typeof v === 'object') {
+            super.append(key, JSON.stringify(v));
+          } else {
+            super.append(key, v);
+          }
+        }
       }
+    } else if (value === null) {
+      super.delete(key);
     } else {
       super.set(key, value);
-
-      if (String(value) !== String(oldValue)) {
-        this.changed = true;
-      }
     }
 
     this.sort();
+    this.changed ||= changed;
   }
 
   /**
@@ -79,3 +65,40 @@ export default class Permalink extends URLSearchParams {
     }
   }
 }
+
+function equals(value, oldValue) {
+  if (Array.isArray(value) || Array.isArray(oldValue)) {
+    value = toArray(value);
+    oldValue = toArray(oldValue);
+
+    if (value.length !== oldValue.length) {
+      return false;
+    }
+
+    return value.every((v, i) => equals(v, oldValue[i]));
+  }
+
+  // (value ?? oldValue ?? true) returns true if they're both empty (null or undefined)
+  [value, oldValue] = [value, oldValue].map(v => (!v && v !== false && v !== 0 ? null : v));
+  return value === oldValue || String(value) === String(oldValue);
+}
+
+/**
+ * Convert a value to an array. `undefined` and `null` values are converted to an empty array.
+ * @param {*} value - The value to convert.
+ * @returns {any[]} The converted array.
+ */
+function toArray(value) {
+  value ??= [];
+
+  if (Array.isArray(value)) {
+    return value;
+  }
+
+  // Don't convert "foo" into ["f", "o", "o"]
+  if (typeof value !== 'string' && typeof value[Symbol.iterator] === 'function') {
+    return Array.from(value);
+  }
+
+  return [value];
+}
diff --git a/docs/docs/palettes/tweak.js b/docs/docs/palettes/tweak.js
index 28b131210..e8824d1b9 100644
--- a/docs/docs/palettes/tweak.js
+++ b/docs/docs/palettes/tweak.js
@@ -46,7 +46,7 @@ let paletteAppSpec = {
     return {
       uid: undefined,
       paletteId,
-      paletteTitle: palette.title,
+      originalPaletteTitle: palette.title,
       originalColors: palette.colors,
       permalink: new Permalink(),
       hueRanges,
@@ -56,6 +56,8 @@ let paletteAppSpec = {
       grayColor: undefined,
       tweaking: {},
       saved: null,
+      unsavedChanges: false,
+      savedPalettes: sidebar.palettes.saved,
     };
   },
 
@@ -63,20 +65,16 @@ let paletteAppSpec = {
     // Non-reactive variables to expose
     Object.assign(this, { moreHue });
 
-    // Read URL params and apply them. This facilitates permalinks.
-    this.permalink.mapObject(this.hueShifts, {
-      keyTo: key => key.replace(/-shift$/, ''),
-      keyFrom: key => key + '-shift',
-      valueFrom: value => (!value ? '' : Number(value)),
-      valueTo: value => (!value ? 0 : Number(value)),
-    });
-
     this.grayChroma = this.originalGrayChroma;
     this.grayColor = this.originalGrayColor;
 
     if (location.search) {
-      // Update from URL
-      this.permalink.writeTo(this.hueShifts);
+      // Read URL params and apply them. This facilitates permalinks.
+      for (let hue in this.hueShifts) {
+        if (this.permalink.has(hue + '-shift')) {
+          this.hueShifts[hue] = Number(this.permalink.get(hue + '-shift'));
+        }
+      }
 
       for (let param of ['chroma-scale', 'gray-color', 'gray-chroma']) {
         if (this.permalink.has(param)) {
@@ -94,9 +92,8 @@ let paletteAppSpec = {
 
       if (this.permalink.has('uid')) {
         this.uid = Number(this.permalink.get('uid'));
+        this.saved = sidebar.palettes.saved.find(p => p.uid === this.uid);
       }
-
-      this.saved = sidebar.palette.getSaved(this.getPalette());
     }
   },
 
@@ -104,9 +101,30 @@ let paletteAppSpec = {
     for (let ref in this.$refs) {
       this.$refs[ref].tooltipFormatter = percentFormatter;
     }
+
+    nextTick().then(() => {
+      if (!this.tweaked || this.saved) {
+        this.unsavedChanges = false;
+      }
+    });
   },
 
   computed: {
+    /** Default palette title for saving */
+    defaultPaletteTitle() {
+      return this.originalPaletteTitle + ' (tweaked)';
+    },
+
+    paletteTitle() {
+      if (this.saved) {
+        return this.saved.title;
+      } else if (this.tweaked) {
+        return this.defaultPaletteTitle;
+      } else {
+        return this.originalPaletteTitle;
+      }
+    },
+
     tweaks() {
       return {
         hueShifts: this.hueShifts,
@@ -284,7 +302,9 @@ let paletteAppSpec = {
     hueShifts: {
       deep: true,
       handler() {
-        this.permalink.readFrom(this.hueShifts);
+        for (let hue in this.hueShifts) {
+          this.permalink.set(hue + '-shift', this.hueShifts[hue], 0);
+        }
       },
     },
 
@@ -308,58 +328,56 @@ let paletteAppSpec = {
         // Update page URL
         this.permalink.updateLocation();
 
-        if (this.saved) {
-          this.save({ silent: true });
-        }
+        this.unsavedChanges = true;
+      },
+    },
+
+    saved: {
+      deep: true,
+      handler() {
+        this.unsavedChanges = !this.saved;
       },
     },
   },
 
   methods: {
-    getPalette() {
-      return { id: this.paletteId, uid: this.uid, search: location.search };
-    },
-
-    save({ silent } = {}) {
-      let title = silent
-        ? (this.saved?.title ?? this.paletteTitle)
-        : prompt('Palette title:', `${this.paletteTitle} (tweaked)`);
-
-      if (!title) {
-        return;
-      }
-
+    async save({ title } = {}) {
       let uid = this.uid;
 
-      if (!uid) {
-        // First time saving
-        this.uid = uid = sidebar.palette.getUid();
+      this.saved ??= { id: this.paletteId, uid: this.uid };
 
-        this.permalink.set('uid', uid);
-        this.permalink.updateLocation();
+      if (title) {
+        // Renaming
+        this.saved.title = title;
+      } else {
+        this.saved.title ??= this.defaultPaletteTitle;
       }
 
-      let palette = { ...this.getPalette(), uid, title };
+      this.saved.search = location.search;
 
-      sidebar.palette.save(palette, this.saved);
-      this.saved = palette;
+      this.saved = sidebar.palette.save(this.saved);
+
+      if (uid !== this.saved.uid) {
+        // UID changed (most likely from saving a new palette)
+        this.uid = this.saved.uid;
+        this.permalink.set('uid', this.uid);
+        this.permalink.updateLocation();
+        await this.$nextTick();
+        this.save(); // Save again to update the search param to include the UID
+      }
+
+      this.unsavedChanges = false;
     },
 
     rename() {
-      if (!this.saved) {
-        return;
+      let newTitle = prompt('Palette title:', this.saved?.title ?? this.defaultPaletteTitle);
+
+      if (newTitle && newTitle !== this.saved?.title) {
+        this.save({ title: newTitle });
       }
-
-      let newTitle = prompt('New title:', this.saved.title);
-
-      if (!newTitle) {
-        return;
-      }
-
-      this.saved.title = newTitle;
-      sidebar.palette.save(this.saved);
     },
 
+    // Cannot name this delete() because Vue complains
     deleteSaved() {
       sidebar.palette.delete(this.saved);
     },
diff --git a/docs/docs/themes/remix.js b/docs/docs/themes/remix.js
index f997541f0..a6e9d8413 100644
--- a/docs/docs/themes/remix.js
+++ b/docs/docs/themes/remix.js
@@ -54,8 +54,12 @@ function init() {
     urlParams: new Permalink(),
   };
 
-  data.urlParams.mapObject(data.params);
-  data.urlParams.writeTo(data.params);
+  // Apply params from permalink
+  for (let key in data.params) {
+    if (data.urlParams.has(key)) {
+      data.params[key] = data.urlParams.get(key);
+    }
+  }
 
   if (computed.isRemixed) {
     // Start with the remixing UI open if the theme has been remixed
@@ -128,7 +132,11 @@ function render(changedAspect) {
     selects[aspect].value = value;
   }
 
-  data.urlParams.readFrom(data.params);
+  for (let key in data.params) {
+    if (data.params[key]) {
+      data.urlParams.set(key, data.params[key]);
+    }
+  }
 
   // Update demo URL
   domChange(() => {