This is easily one of the simplest solutions I've ever hunted. It does one thing, and it does it well: Easy Eye Scan reduces the amount of extraneous information in your Gmail, and it "relaxes" the list view somewhat, in order to help you scan your emails faster.
In addition to helping those of us with normal vision, it is a nice accessibility option for those with compromised vision. I wouldn't go as far as saying this is an accessibility extension for Chrome, but it certainly would help those that need a simpler Gmail interface.
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