Release build - 1.21.10b (2026-07-29)

Zen Stable Release

New Features

• Updated Firefox to 153.0.1

Fixes

• Various performance fixes, RTX Super Resolution not working, and HDR video playback not working on Windows (#14292)
• Fixed extra divider when urlbar has no results (#14717)
• Fix boost applying wrong size override (#14461)
• Fixed crashes/hangs when creating new spaces (#14713)
• Fixed non-tab drags allowing to switch Spaces (#14724)
• Fixed essential tab reordering not working at maximum capacity (#14726)
• Fixed compact sidebar activation at right screen edge (#14409)
• Other bug fixes and improvements.