addon Manager does not open in the tab how to change?

My addon Manager opens in a floating window, but I want to open it in the tab. How can I change this?

The normal behavior is to open the Add-ons Manager in a tab. You should check to see that an add-on is causing this to happen. For details on how to do this see Troubleshooting extensions and themes and problems of hardware acceleration to resolve common Firefox problems.

An add-on that can cause this is Mr Tech Toolkit.

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