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Gmail - Add Row Highlights 1.0.1-signed.1-signed Requires Restart
Highlights the letter rows in the new Gmail when you hover over them with the mouse cursor.
This add-on has been marked as experimental by its developers
This add-on is not compatible with your version of Firefox because of the following:
About this Add-on
Highlights a letter as pale orange if it is read, and light green if it is unread.
I'd like to give credit to the original creator of the idea - Jhon