diff --git a/addons/addon-canvas/src/CanvasRenderer.ts b/addons/addon-canvas/src/CanvasRenderer.ts
index 947213d4..148ae736 100644
--- a/addons/addon-canvas/src/CanvasRenderer.ts
+++ b/addons/addon-canvas/src/CanvasRenderer.ts
@@ -10,9 +10,9 @@ import { createRenderDimensions } from 'browser/renderer/shared/RendererUtils';
 import { IRenderDimensions, IRenderer, IRequestRedrawEvent } from 'browser/renderer/shared/Types';
 import { ICharSizeService, ICharacterJoinerService, ICoreBrowserService, IThemeService } from 'browser/services/Services';
 import { EventEmitter, forwardEvent } from 'common/EventEmitter';
-import { Disposable, toDisposable } from 'common/Lifecycle';
+import { Disposable, MutableDisposable, toDisposable } from 'common/Lifecycle';
 import { IBufferService, ICoreService, IDecorationService, IOptionsService } from 'common/services/Services';
-import { IDisposable, Terminal } from '@xterm/xterm';
+import { Terminal } from '@xterm/xterm';
 import { CursorRenderLayer } from './CursorRenderLayer';
 import { LinkRenderLayer } from './LinkRenderLayer';
 import { SelectionRenderLayer } from './SelectionRenderLayer';
@@ -22,7 +22,7 @@ import { IRenderLayer } from './Types';
 export class CanvasRenderer extends Disposable implements IRenderer {
   private _renderLayers: IRenderLayer[];
   private _devicePixelRatio: number;
-  private _observerDisposable: IDisposable | undefined;
+  private _observerDisposable = this.register(new MutableDisposable());
 
   public dimensions: IRenderDimensions;
 
@@ -61,10 +61,9 @@ export class CanvasRenderer extends Disposable implements IRenderer {
     this._devicePixelRatio = this._coreBrowserService.dpr;
     this._updateDimensions();
 
-    this._observerDisposable = observeDevicePixelDimensions(this._renderLayers[0].canvas, this._coreBrowserService.window, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
+    this._observerDisposable.value = observeDevicePixelDimensions(this._renderLayers[0].canvas, this._coreBrowserService.window, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
     this.register(this._coreBrowserService.onWindowChange(w => {
-      this._observerDisposable?.dispose();
-      this._observerDisposable = observeDevicePixelDimensions(this._renderLayers[0].canvas, w, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
+      this._observerDisposable.value = observeDevicePixelDimensions(this._renderLayers[0].canvas, w, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
     }));
 
     this.register(toDisposable(() => {
@@ -189,9 +188,4 @@ export class CanvasRenderer extends Disposable implements IRenderer {
   private _requestRedrawViewport(): void {
     this._onRequestRedraw.fire({ start: 0, end: this._bufferService.rows - 1 });
   }
-
-  public override dispose(): void {
-    this._observerDisposable?.dispose();
-    super.dispose();
-  }
 }
diff --git a/addons/addon-webgl/src/WebglRenderer.ts b/addons/addon-webgl/src/WebglRenderer.ts
index b5f378c2..f2f2c83e 100644
--- a/addons/addon-webgl/src/WebglRenderer.ts
+++ b/addons/addon-webgl/src/WebglRenderer.ts
@@ -19,7 +19,7 @@ import { AttributeData } from 'common/buffer/AttributeData';
 import { CellData } from 'common/buffer/CellData';
 import { Attributes, Content, NULL_CELL_CHAR, NULL_CELL_CODE } from 'common/buffer/Constants';
 import { ICoreService, IDecorationService, IOptionsService } from 'common/services/Services';
-import { IDisposable, Terminal } from '@xterm/xterm';
+import { Terminal } from '@xterm/xterm';
 import { GlyphRenderer } from './GlyphRenderer';
 import { RectangleRenderer } from './RectangleRenderer';
 import { COMBINED_CHAR_BIT_MASK, RENDER_MODEL_BG_OFFSET, RENDER_MODEL_EXT_OFFSET, RENDER_MODEL_FG_OFFSET, RENDER_MODEL_INDICIES_PER_CELL, RenderModel } from './RenderModel';
@@ -33,7 +33,7 @@ export class WebglRenderer extends Disposable implements IRenderer {
   private _charAtlasDisposable = this.register(new MutableDisposable());
   private _charAtlas: ITextureAtlas | undefined;
   private _devicePixelRatio: number;
-  private _observerDisposable: IDisposable | undefined;
+  private _observerDisposable = this.register(new MutableDisposable());
 
   private _model: RenderModel = new RenderModel();
   private _workCell: CellData = new CellData();
@@ -124,10 +124,9 @@ export class WebglRenderer extends Disposable implements IRenderer {
       this._requestRedrawViewport();
     }));
 
-    this._observerDisposable = observeDevicePixelDimensions(this._canvas, this._coreBrowserService.window, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
+    this._observerDisposable.value = observeDevicePixelDimensions(this._canvas, this._coreBrowserService.window, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
     this.register(this._coreBrowserService.onWindowChange(w => {
-      this._observerDisposable?.dispose();
-      this._observerDisposable = observeDevicePixelDimensions(this._canvas, w, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
+      this._observerDisposable.value = observeDevicePixelDimensions(this._canvas, w, (w, h) => this._setCanvasDevicePixelDimensions(w, h));
     }));
 
     this._core.screenElement!.appendChild(this._canvas);
@@ -599,11 +598,6 @@ export class WebglRenderer extends Disposable implements IRenderer {
     const cursorY = this._terminal.buffer.active.cursorY;
     this._onRequestRedraw.fire({ start: cursorY, end: cursorY });
   }
-
-  public override dispose(): void {
-    this._observerDisposable?.dispose();
-    super.dispose();
-  }
 }
 
 // TODO: Share impl with core
diff --git a/src/browser/services/RenderService.ts b/src/browser/services/RenderService.ts
index e8d59f7e..c2cb9a05 100644
--- a/src/browser/services/RenderService.ts
+++ b/src/browser/services/RenderService.ts
@@ -3,7 +3,6 @@
  * @license MIT
  */
 
-import { IDisposable } from 'common/Types';
 import { RenderDebouncer } from 'browser/RenderDebouncer';
 import { IRenderDebouncerWithCallback } from 'browser/Types';
 import { IRenderDimensions, IRenderer } from 'browser/renderer/shared/Types';
@@ -25,7 +24,7 @@ export class RenderService extends Disposable implements IRenderService {
   private _renderer: MutableDisposable<IRenderer> = this.register(new MutableDisposable());
   private _renderDebouncer: IRenderDebouncerWithCallback;
   private _pausedResizeTask = new DebouncedIdleTask();
-  private _observerDisposable: IDisposable | undefined;
+  private _observerDisposable = this.register(new MutableDisposable());
 
   private _isPaused: boolean = false;
   private _needsFullRefresh: boolean = false;
@@ -110,11 +109,10 @@ export class RenderService extends Disposable implements IRenderService {
   private _registerIntersectionObserver(w: Window & typeof globalThis, screenElement: HTMLElement): void {
     // Detect whether IntersectionObserver is detected and enable renderer pause
     // and resume based on terminal visibility if so
-    this._observerDisposable?.dispose();
     if ('IntersectionObserver' in w) {
       const observer = new w.IntersectionObserver(e => this._handleIntersectionChange(e[e.length - 1]), { threshold: 0 });
       observer.observe(screenElement);
-      this._observerDisposable = toDisposable(() => observer.disconnect());
+      this._observerDisposable.value = toDisposable(() => observer.disconnect());
     }
   }
 
@@ -283,9 +281,4 @@ export class RenderService extends Disposable implements IRenderService {
   public clear(): void {
     this._renderer.value?.clear();
   }
-
-  public override dispose(): void {
-    this._observerDisposable?.dispose();
-    super.dispose();
-  }
 }