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How do I disable tabs? [58.0.2]

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This used to work: https://addons.mozilla.org/en-US/firefox/addon/hide-tab-bar-with-one-tab/ but apparently not with the current version. Is there a different workaround?

This used to work: https://addons.mozilla.org/en-US/firefox/addon/hide-tab-bar-with-one-tab/ but apparently not with the current version. Is there a different workaround?

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