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Works for me in Chromium. It triggers when you move your cursor up to the top of the viewport.

If your cursor never enters the viewport it doesn't fire. If your cursor exits the viewport at the side or bottom and doesn't reenter it doesn't fire. If you close or switch tabs with a key combination it doesn't fire.

Also, I hate modal popups.

Same experience. I middle clicked on the tab and...it...closed. Without an issue.

Works for me. It triggers when the mouse leaves the viewport near the top

I get the modal when the window opens but not when the tab closes.

I don't think it's intended that the plugin prevents the tab from actually closing (that would be very annoying). It's just to present the user something (special offer, ad, ...)

Neither in Safari 7.0.4