Three times I cleared my browser history because of this add-on.
It was my mistake but that menu item really shouldn't be there.
Deleted.

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Nice! A "Forget closed tabs" was added and the bug related to number of undo items was fixed by forcing the max number to be 25.
Still, I think the "Clear history" should be gone and I hope the button directly open the last tab and show the list with a drop down menu.

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It is mostly nicely done. But as mentioned by others, the "Clear history" is terribly wrong. I lost my browser history because of it.
There is no need to "Show full history" or "Clear history". What users need is "Clear closed tabs".

Another bug is that it always shows "Nothing to restore if the number of undo items is set to be more than 25.

But the way, wouldn't it be nice to have the button to undo last closed tab, and have a little arrow on the right to show the menu?