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Downgrade firefox to version 56.0.2, stuck with firefox 57.

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I use firefox because of tree style tabs from past 3 years, but now there are tabs on top also, which I cannot find a way to remove. Looks very bad. Please help me achieve the previous theme or downgrade.

I use firefox because of tree style tabs from past 3 years, but now there are tabs on top also, which I cannot find a way to remove. Looks very bad. Please help me achieve the previous theme or downgrade.

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Hi, you can remove the tabs on top by adding this to your userChrome.css file: #tabbrowser-tabs { visibility: collapse !important; }