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Mozilla Releases Firefox 135: Quantum Rendering Engine for Linux and Vertical Tabs

Dargslan Team | April 3, 2026 | Updated: April 16, 2026 | 1 min read | 1 views
Mozilla Releases Firefox 135: Quantum Rendering Engine for Linux and Vertical Tabs

Mozilla has released Firefox 135, bringing rendering performance improvements and UI options that power users have long requested.

Quantum Renderer on Linux

The WebRender successor codenamed Quantum is now the default on Linux systems with supported GPU drivers (Mesa 24.0+, NVIDIA 565+). Benchmarks show 20-35% faster page rendering and much smoother scrolling on content-heavy sites.

Native Vertical Tabs

Vertical tabs in the sidebar are available without extensions, with drag-to-reorder, tab groups, and automatic hibernation for background tabs. Toggle via the customize toolbar menu.

New for Developers

  • DevTools: Redesigned Performance panel with flame graph and profiler integration
  • WebGPU enabled by default on all platforms
  • CSS scroll-driven-animations and view-transitions ship unflagged
  • Temporal API available on Nightly behind a flag
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