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Definitions are now displayed within a pop-up window. I've given up trying to fit them inside the tab - there have been too many breakages due to understandable changes being made by Google.
The new method seems to work quite nicely. A tip is to leave the definitions window open - next time you want a definition it will load faster as the existing window will be re-used.
Let me know what you think of this! I'm also considering adding a panel at the bottom of the tab, like the Split Pannel extension.