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EXT_disjoint_timer_query

WebGL Extension

WebGL1 Fingerprinting Signal
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What is EXT_disjoint_timer_query?

The EXT_disjoint_timer_query extension is part of the WebGL API and provides a way to measure the duration of GL commands without stalling the rendering pipeline. Provides query objects, constants (QUERY_COUNTER_BITS_EXT, TIME_ELAPSED_EXT, TIMESTAMP_EXT, GPU_DISJOINT_EXT), and methods like createQueryEXT(), beginQueryEXT(), endQueryEXT(). Available in WebGL1 only; in WebGL2, use EXT_disjoint_timer_query_webgl2.

Read MDN Documentation

Browser Support

Checking Extension Support
This extension is part of the WebGL1 specification. Browser support varies based on:
  • Graphics card model and capabilities
  • GPU driver version
  • Browser version and vendor
  • Operating system

Usage in Web Scraping & Anti-Bot Bypass

Modern anti-bot systems verify WebGL extensions to detect automated browsers. Mismatches between GPU hardware and available extensions are strong bot signals.

What Anti-Bot Systems Check:
  • Extension availability: Does the reported GPU support these extensions?
  • Extension combinations: Are the extensions typical for this GPU model?
  • Consistency checks: Do reported extensions match other GPU signals?
  • Missing extensions: Are expected extensions for this GPU absent?
Scrapfly's Anti-Scraping Protection (ASP)
Scrapfly automatically manages WebGL fingerprint consistency, ensuring all extensions match the emulated GPU profile. This prevents detection by anti-bot systems that verify WebGL data.
Learn About ASP Bypass

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