How do I remove the white box on the top left corner of my Mac computer?
I keep getting a white box on the top left corner of my computer. It doesn't come up right away but when I what to restore previous session it comes up. This has just reoccurred lately I had this problem before and it stopped for awhile but now its back. My Mac version is 10.6.8
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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
- Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
Try to disable hardware acceleration in Firefox.
- Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
- https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes