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Tab closed UNDO stays up

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When closing a tab a button shows up at the bottom of the page. The button contains "Tab closed UNDO"

It won't go away. It is on the bottom of this page right now. If I switch tabs it stays on every page. Generally have to switch to another app on Android and come back to make it go away.

When closing a tab a button shows up at the bottom of the page. The button contains "Tab closed UNDO" It won't go away. It is on the bottom of this page right now. If I switch tabs it stays on every page. Generally have to switch to another app on Android and come back to make it go away.

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Did you try to click UNDO?

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Do you mean in Firefox Preview, the new browser under development?

Unfortunately, this has been going on for a while, that the "toast" doesn't fade out after a short time like it should. You may need to wait a few extra seconds and tap UNDO to dismiss the toast.

Related (unsolved) thread: https://support.mozilla.org/questions/1279180