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How do I stop an x mark pop up upon opening Firefox?

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  • Paskiausią atsakymą parašė the-edmeister

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When I log on to Firefox an X mark registration pop up appears. I can't stop this pop up from appearing. I need to know how to stop it.

Thanks.

When I log on to Firefox an '''''X mark''''' registration pop up appears. I can't stop this pop up from appearing. I need to know how to stop it. Thanks.

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Disable the Xmarks extension??