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About this Add-on
With this add-on a tab is not closed, but hidden; when you "close" another tab, hidden tab is closed and "closed" tab is hidden.
When you see one tab with close button on it, it means presence of a second, hidden, tab. To close it, close the one tab you see and reopen it. It will be without close-button: there is no hidden tab.
The extension is too simple to have any bugs. But, if you find any, or if you want to request an extension for reopening many closed tabs, not just the last one, or if you have another suggestions, write on the support email address or write a review below.