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How do I stop the error console from starting with the browser?

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A few days ago, the error console started opening up with the browser. Whenever I open a new window, or restart the browser, the error console comes up. How do I stop this behavior?

A few days ago, the error console started opening up with the browser. Whenever I open a new window, or restart the browser, the error console comes up. How do I stop this behavior?

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This issue can be caused by a (mouse gesture) extension that isn't working properly.

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