diff --git a/src/browser/CoreBrowserTerminal.ts b/src/browser/CoreBrowserTerminal.ts
index d089c62c0..2b024e72e 100644
--- a/src/browser/CoreBrowserTerminal.ts
+++ b/src/browser/CoreBrowserTerminal.ts
@@ -505,7 +505,7 @@ export class CoreBrowserTerminal extends CoreTerminal implements ITerminal {
       this.textarea,
       parent.ownerDocument.defaultView ?? window,
       // Force unsafe null in node.js environment for tests
-      this._document ?? (typeof window !== 'undefined') ? window.document : null as any
+      this._document ?? ((typeof window !== 'undefined') ? window.document : null as any)
     ));
     this._instantiationService.setService(ICoreBrowserService, this._coreBrowserService);
 
diff --git a/src/browser/RenderDebouncer.ts b/src/browser/RenderDebouncer.ts
index f6ea59bf6..eeadbe018 100644
--- a/src/browser/RenderDebouncer.ts
+++ b/src/browser/RenderDebouncer.ts
@@ -23,7 +23,7 @@ export class RenderDebouncer implements IRenderDebouncerWithCallback {
   }
 
   public dispose(): void {
-    if (this._animationFrame) {
+    if (this._animationFrame !== undefined) {
       this._coreBrowserService.window.cancelAnimationFrame(this._animationFrame);
       this._animationFrame = undefined;
     }
@@ -31,9 +31,7 @@ export class RenderDebouncer implements IRenderDebouncerWithCallback {
 
   public addRefreshCallback(callback: FrameRequestCallback): number {
     this._refreshCallbacks.push(callback);
-    if (!this._animationFrame) {
-      this._animationFrame = this._coreBrowserService.window.requestAnimationFrame(() => this._innerRefresh());
-    }
+    this._animationFrame ??= this._coreBrowserService.window.requestAnimationFrame(() => this._innerRefresh());
     return this._animationFrame;
   }
 
@@ -46,7 +44,7 @@ export class RenderDebouncer implements IRenderDebouncerWithCallback {
     this._rowStart = this._rowStart !== undefined ? Math.min(this._rowStart, rowStart) : rowStart;
     this._rowEnd = this._rowEnd !== undefined ? Math.max(this._rowEnd, rowEnd) : rowEnd;
 
-    if (this._animationFrame) {
+    if (this._animationFrame !== undefined) {
       return;
     }
 
diff --git a/src/browser/TimeBasedDebouncer.ts b/src/browser/TimeBasedDebouncer.ts
index 6c92aad24..27b692bae 100644
--- a/src/browser/TimeBasedDebouncer.ts
+++ b/src/browser/TimeBasedDebouncer.ts
@@ -3,10 +3,10 @@
  * @license MIT
  */
 
-const RENDER_DEBOUNCE_THRESHOLD_MS = 1000; // 1 Second
-
 import { IRenderDebouncer } from './Types';
 
+const RENDER_DEBOUNCE_THRESHOLD_MS = 1000; // 1 Second
+
 /**
  * Debounces calls to update screen readers to update at most once configurable interval of time.
  */
@@ -31,7 +31,9 @@ export class TimeBasedDebouncer implements IRenderDebouncer {
   public dispose(): void {
     if (this._refreshTimeoutID) {
       clearTimeout(this._refreshTimeoutID);
+      this._refreshTimeoutID = undefined;
     }
+    this._additionalRefreshRequested = false;
   }
 
   public refresh(rowStart: number | undefined, rowEnd: number | undefined, rowCount: number): void {
@@ -48,6 +50,11 @@ export class TimeBasedDebouncer implements IRenderDebouncer {
     const refreshRequestTime: number = performance.now();
     if (refreshRequestTime - this._lastRefreshMs >= this._debounceThresholdMS) {
       // Enough time has elapsed since the last refresh; refresh immediately
+      if (this._refreshTimeoutID !== undefined) {
+        clearTimeout(this._refreshTimeoutID);
+        this._refreshTimeoutID = undefined;
+        this._additionalRefreshRequested = false;
+      }
       this._lastRefreshMs = refreshRequestTime;
       this._innerRefresh();
     } else if (!this._additionalRefreshRequested) {
diff --git a/src/browser/input/Mouse.ts b/src/browser/input/Mouse.ts
index 9ea1d6019..c9840aec2 100644
--- a/src/browser/input/Mouse.ts
+++ b/src/browser/input/Mouse.ts
@@ -37,10 +37,6 @@ export function getCoords(window: Pick<Window, 'getComputedStyle'>, event: Pick<
   }
 
   const coords = getCoordsRelativeToElement(window, event, element);
-  if (!coords) {
-    return undefined;
-  }
-
   coords[0] = Math.ceil((coords[0] + (isSelection ? cssCellWidth / 2 : 0)) / cssCellWidth);
   coords[1] = Math.ceil(coords[1] / cssCellHeight);
 
diff --git a/src/browser/input/MoveToCell.ts b/src/browser/input/MoveToCell.ts
index b5ddc7ca2..9cc27088d 100644
--- a/src/browser/input/MoveToCell.ts
+++ b/src/browser/input/MoveToCell.ts
@@ -156,7 +156,7 @@ function wrappedRowsForRow(currentRow: number, bufferService: IBufferService): n
  */
 function horizontalDirection(startX: number, startY: number, targetX: number, targetY: number, bufferService: IBufferService, applicationCursor: boolean): Direction {
   let startRow;
-  if (moveToRequestedRow(targetX, targetY, bufferService, applicationCursor).length > 0) {
+  if (moveToRequestedRow(startY, targetY, bufferService, applicationCursor).length > 0) {
     startRow = targetY - wrappedRowsForRow(targetY, bufferService);
   } else {
     startRow = startY;
diff --git a/src/browser/renderer/dom/DomRenderer.ts b/src/browser/renderer/dom/DomRenderer.ts
index de08ac0ac..383cf3025 100644
--- a/src/browser/renderer/dom/DomRenderer.ts
+++ b/src/browser/renderer/dom/DomRenderer.ts
@@ -694,7 +694,7 @@ class CursorBlinkStateManager {
   }
 
   private _clearIdleTimer(): void {
-    if (this._idleTimeout) {
+    if (this._idleTimeout !== undefined) {
       this._coreBrowserService.window.clearTimeout(this._idleTimeout);
       this._idleTimeout = undefined;
     }