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see my screenshot..a small arrow above, right,close to - ..x /new tab/ how can i disable it?

see my screenshot..a small arrow above, right,close to - ..x /new tab/ how can i disable it?
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many thanks, i am glad

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Enter about:config in the URL bar and set browser.tabs.tabmanager.enabled = false, then restart the browser.

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many thanks, i am glad