**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)
