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What is XBL binding?

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I get "Error launching browser window no XBL binding" message

I get "Error launching browser window no XBL binding" message

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That issue can be caused by an 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).