Fix message hovers on Firefox, esp "Delete" (Trashcan) Icon
After deleting a message with the trash can hover, the next message pops up. On Chrome, the trash can icon appears as expected. But on Firefox, you have to move the mouse out of the pane (either hover over another message, or move right to the preview pane and then back over the message. This makes deleting many messages in a row painful. It's a simple implementation bug, but worth fixing as Firefox is still a very popular browser.
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