Firefox window shrinks on unlock and requires manual minimize/maximize to restore full dimensions

rahulschauhan50 — Wed, 26 Aug 2026 06:42:04 GMT

**Steps to Reproduce:**
1. Open Firefox, maximize the window to fill the screen.
2. Lock the MacBook (`Control + Command + Q`).
3. Unlock the MacBook while Firefox is the frontmost application.
4. Observe the edge padding/shrunken window.
5. Click the minimize button (-), then click the dock icon to restore.

**Actual Result:**
- Step 4: The window shrinks inward, leaving visible padding from the screen edges.
- Step 5: Minimizing and restoring instantly forces the window back to its correct full dimensions.

**Workaround:**
Minimizing and un-minimizing (or manually resizing any edge) forces the window to redraw correctly.

**Screenshots**
The bug was not appearing in screenshot.

**System**
MacBook Air (MacOS Tahoe 26.5.2)
Firefox (v 154)

topic Firefox window shrinks on unlock and requires manual minimize/maximize to restore full dimensions in Firefox Labs

Firefox window shrinks on unlock and requires manual minimize/maximize to restore full dimensions