VS Code 1.141 Adds Frosted Glass to Popovers: Config & Performance Impact

Where Frosted Glass Applies

The effect targets menus, the command palette, and other popover layers — right-click menus, quick file switcher, settings search — letting editor content show through. Window borders, sidebars, and terminal backgrounds remain unchanged.

Configuration

Transparency is controlled by modernUIFrostedGlassOpacity; lower values increase transparency, higher values approach solid color. No default or recommended value is documented. The feature is gated behind experimental flags:

{
  "workbench.experimental.modernUI": true,
  // Disabling modernUIFrostedGlass reverts popovers to solid color
  "workbench.modernUIFrostedGlass": true,
  "workbench.modernUIFrostedGlassOpacity": 0.6
}

Community History

Frosted glass is not a new idea; third-party solutions existed but required patching, config tweaks, launch arguments, and constant re-adaptation to VS Code updates.

Official Integration Benefits

Microsoft's native implementation follows system and VS Code preferences, automatically falls back to solid colors in high-contrast themes, and provides a simple off switch — more reliable for a tool used 10+ hours daily than community plugins.

Performance Caveat

The release notes warn: if display or performance issues arise, disable the toggle. Frosted glass in Electron is not zero-cost; each popover appearance, movement, or dismissal triggers a background blur recomposition. This overhead does not appear in benchmarks but shows up as higher fan speeds and reduced battery life.

VS Code's UI continues to converge with operating system visual language, at the cost of the editor behaving more like a browser.