After automatic update to firefox 18.0 firefox has totally black screen ( inside border ) if window is on secondary display - normal if window on primary display. Also Mouse cursor (arrow) has black box around it when firefox on secondary display. Display is normal if frame partially overlaps primary display. Environment: Lenovo 9088CTO desktop, 3072 Megabytes Usable Installed Memory Windows XP PRO all updates. ATI Radeon HD 2600 XT [Display adapter] IBM L200P [Monitor] (20.2"vis, s/n 66-C5539, October 2003) IBM L200P [Monitor] (20.2"vis, s/n 66-G8505, April 2004)
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Try to disable hardware acceleration in Firefox.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"