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Firefox hangs for a while then shows a weird window.

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After a while firefox will hang and 60 seconds later it shows this : http://yfrog.com/ny7cr5j

After a while firefox will hang and 60 seconds later it shows this : http://yfrog.com/ny7cr5j

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

In Firefox 4 and later Safe mode disables extensions and disables hardware acceleration.

  • Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"