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One click to close the last opened popup window with safeguards to prevent accidentally closing the wrong window.

Use the toolbar button to close the last opened popup window based on a set of criteria:

1. Only popups older than 0.5 seconds will be closed
2. Popups older than 3 minutes will not be closed (you will be notified)
3. If a popup is closed by its own website, the button is disabled for 0.5 seconds
4. Popups with 2 or more tabs open will not be closed
5. Successive clicks on the toolbar button will close popups in reverse chronological order

On first install, there is a demo page which allows you to open a popup and then test clicking on the toolbar button.