Gmail Conversation Preview Bubbles
Probably one of the reason that google have banned before Greasemonkey is that one of the scripts there maked changes in Gmail that TOS don't agree. But this one is really a great feature that allow to preview conversation in Gmail
Want preview bubbles for conversations in Gmail, as shown in the screenshot on the left? Then install the Gmail Conversation Preview Greasemonkey script. You can then right-click on any conversation to see its recent messages in a preview bubble.
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