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Cannot run Firefox, because of an add-on

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Hello! I was in the builder.addons.mozilla.org and I was building my add-on. I viewed the documentation and I opened the "windows" docs. Then I saw a code that closes the window and I wanted to try it. Then... it closed the window and I can't start mozilla. What should I do?

Hello! I was in the builder.addons.mozilla.org and I was building my add-on. I viewed the documentation and I opened the "windows" docs. Then I saw a code that closes the window and I wanted to try it. Then... it closed the window and I can't start mozilla. What should I do?

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Found the answer.

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Found the answer.