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I kept losing the tab bar while I had this extension enabled. No more problems with the tab bar since disabling the extension.

Это отзыв для предыдущей версии этого дополнения (0.7.0.3). 

No other user has reported such problem, and I didn't add any functionality related to the tab bar, so I'm quite sure this is the result of a conflict with some other extension you've installed. In any case, I cannot reproduce your issue if I don't know anything about your environment.