In certain situations, closing a tab would activate the tab to the right rather than the left. This happened when the browser closed more than one tab at the same time — for example, when using "Close Tabs to the Right", closing multiple selected tabs, or "Close Other Tabs". The extension was assuming only one tab had been removed, so its position math could point at the wrong tab. It now finds the correct target by matching tab IDs directly against the pre-close tab order, which works reliably regardless of how many tabs were removed at once.