brave/brave-browser

PWA window outside frame corners remain rounded on Linux even with system titlebar enabled

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#53461 opened on Mar 9, 2026

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OS/DesktopOS/Linuxfeature/pwahelp wantedpriority/P5

Description

Brave Version: 1.87.192 (Chromium 145.0.7632.120) OS: Ubuntu 24.04.4 LTS DE: GNOME 46.0 on X11 GPU: AMD Radeon Vega

Problem

PWA app windows (e.g. WhatsApp Web) have rounded outside window frame corners that cannot be disabled.

What I tried:

  • "Use system title bar and borders" = ON ✅
  • "Show rounded corners on main content areas" = OFF ✅
  • Added --use-system-title-bar to PWA desktop file ✅
  • Disabled BraveWebViewRoundedCorners flag ✅
  • All failed — PWA corners still rounded ❌

Proof this is Brave controlled:

  • Regular Brave browser windows = square corners ✅
  • Pure GTK apps = square corners ✅
  • Only Brave PWA windows = rounded ❌
  • Changing GTK theme has zero effect on PWA corners

Expected behavior:

PWA windows should respect "Use system title bar" setting exactly like regular Brave windows do.

Related issue: #50033

Contributor guide

Tech stack
cppcss
Domain
desktop
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Chromium internalsLinux window managementGTK basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate how Brave applies rounded corners to PWA windows on Linux. Look at the Chromium window frame implementation, specifically the handling of the 'Use system title bar and borders' setting and the 'BraveWebViewRoundedCorners' flag. Compare with regular Brave browser windows and GTK apps. The related issue #50033 may contain additional clues. Consider modifying the PWA window creation code to respect the system title bar setting.