Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox windows do not refresh properly when overlapping other windows, occasionally blocking view of others.

more options

Whether with other Firefox windows or other application's windows, the area of overlap will be obscured by a Firefox window behind the active window. This appears to be a screen refresh problem.

Whether with other Firefox windows or other application's windows, the area of overlap will be obscured by a Firefox window behind the active window. This appears to be a screen refresh problem.

All Replies (1)

more options

Could you try disabling graphics hardware acceleration? Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

orange Firefox button or classic Tools menu > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"