diff --git a/src/lib/extension/settings/MiscSettings.ts b/src/lib/extension/settings/MiscSettings.ts
index 94ea7d2..1e0e76d 100644
--- a/src/lib/extension/settings/MiscSettings.ts
+++ b/src/lib/extension/settings/MiscSettings.ts
@@ -1,7 +1,10 @@
 import CacheableSettings from "$lib/extension/base/CacheableSettings.ts";
 
+export type FullscreenViewerSize = 'small' | 'medium' | 'large' | 'full';
+
 interface MiscSettingsFields {
   fullscreenViewer: boolean;
+  fullscreenViewerSize: FullscreenViewerSize;
 }
 
 export default class MiscSettings extends CacheableSettings<MiscSettingsFields> {
@@ -13,7 +16,15 @@ export default class MiscSettings extends CacheableSettings<MiscSettingsFields>
     return this._resolveSetting("fullscreenViewer", true);
   }
 
+  async resolveFullscreenViewerPreviewSize() {
+    return this._resolveSetting('fullscreenViewerSize', 'large');
+  }
+
   async setFullscreenViewerEnabled(isEnabled: boolean) {
     return this._writeSetting("fullscreenViewer", isEnabled);
   }
+
+  async setFullscreenViewerPreviewSize(size: FullscreenViewerSize | string) {
+    return this._writeSetting('fullscreenViewerSize', size as FullscreenViewerSize);
+  }
 }