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How to disable annoing error console

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When opening some pages (mostly in new window) error console is poping up with some errors. It is very annoying, because error window covers other windows. Is there any way to disable this? When I wan to see errors I know how to open error console, so I don't need to be disturbed with annoying pop-ups.

When opening some pages (mostly in new window) error console is poping up with some errors. It is very annoying, because error window covers other windows. Is there any way to disable this? When I wan to see errors I know how to open error console, so I don't need to be disturbed with annoying pop-ups.

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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).