MacDebug

Verified for macOS Tahoe 26.2

How to Fix Safari WebGL Crash in macOS Tahoe 26.2

Symptom: Safari on macOS Tahoe crashes or shows a "This webpage was reloaded because a problem occurred" error when loading 3D content or heavy maps.

TL;DR fix

Start with Fix 1: Reset Safari Feature Flags. If the issue persists after that, try Fix 2: Flush the GPU Cache. Full Terminal commands and step-by-step instructions are in each section below.

Why this happens

macOS Tahoe 26.2 introduces a stricter metal-acceleration layer for WebGL. Some legacy drivers and older site implementations trigger a security sandbox violation, causing the WebKit process to terminate.

Recommended Troubleshooting Tool

Before proceeding with manual fixes, we recommend using CleanMyMac X. Excellent for clearing Safari caches, bloated databases, and stuck background processes.

Fix 1: Reset Safari Feature Flags

  1. Open Safari.
  2. Go to Settings > Advanced.
  3. Check Show features for web developers.
  4. In the menu bar, go to Develop > Feature Flags.
  5. Search for "WebGL" and click Reset All to Defaults.

Fix 2: Flush the GPU Cache

If the crashes persist, clear the lower-level graphics cache:

  1. Close Safari.
  2. Open Terminal.
  3. Paste the following command:
rm -rf ~/Library/Caches/com.apple.Safari/WebKitCache
  1. Restart your Mac.

Recommended Tool: CleanMyMac X

For a deeper clean of system-wide GPU and browser caches that might conflict with Tahoe's new rendering engine, use CleanMyMac X to run the Maintenance scripts and Optimization modules.

Tested and documented by the MacDebug team — about MacDebug. See also Safari Freezing or Crashing on macOS Tahoe 26.2, VoiceOver Not Working Properly in Safari on Sequoia, or browse all guides on macdebug.